To Remove Entrained Material From Article Patents (Class 264/344)
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Patent number: 4536536Abstract: Solutions of ultrahigh molecular weight polymers such as polyethylene in a relatively nonvolatile solvent are extruded through an aperture at constant concentration through the aperture and cooled to form a first gel of indefinite length. The first gels are extracted with a volatile solvent to form a second gel and the second gel is dried to form a low porosity xerogel. The first gel, second gel or xerogel, or a combination, are stretched. Among the products obtainable are polyethylene fibers of greater than 30 or even 40 g/denier tenacity and of modulus greater than 1000 or even 1600 or 2000 g/denier.Type: GrantFiled: October 3, 1983Date of Patent: August 20, 1985Assignee: Allied CorporationInventors: Sheldon Kavesh, Dusan C. Prevorsek
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Patent number: 4521488Abstract: A polyacetal resin composition excellent in heat stability and surface processability which comprises (a) about 100 parts by weight of polyacetal resin, (b) about 2 to about 35 parts by weight of a carbonate, phosphate or acetate of a metal belonging to Group II of the Periodic Table or a mixture thereof and (c) about 0.01 to about 20 parts by weight of a polymer, a copolymer or a mixture thereof of a compound selected from the group consisting of unsaturated polyesters, alkyl esters of acrylic acid or methacrylic acid, amides of acrylic acid or methacrylic acid, triallyl cyanurate, diallyl phthalate, vinyl acetate and divinylbenzene.Type: GrantFiled: January 17, 1984Date of Patent: June 4, 1985Assignee: Asahi Kasei Kogyo Kabushiki KaishaInventors: Yoshihiro Hattori, Takashi Watanabe, Kunio Maeda
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Patent number: 4517315Abstract: A process for producing a film-like or fibrous structure of an aromatic polyester, which comprises(1) forming an unstretched film-like or fibrous structure by melt-shaping a blend comprising 100 parts by weight of (A) an aromatic polyester having a high degree of polymerization derived from an aromatic dicarboxylic acid as a main acid component and an aliphatic diol and/or an alicyclic diol as a main glycol component and (B) 3 to 300 parts by weight of a low-molecular-weight compound being substantially non-reactive with the aromatic polyester (A) and having a boiling point of at least about 200.degree. C.Type: GrantFiled: January 18, 1982Date of Patent: May 14, 1985Assignee: Teijin LimitedInventors: Shunichi Matsumura, Hiroo Inata
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Patent number: 4486376Abstract: A modified polymeric membrane having an excellent separating property is produced by applying, to a porous polymeric membrane, a volatile treating liquid containing a modifying agent which consists of at least one member selected from:(A) volatile dissolving organic liquids each capable of dissolving therein at least 1% by weight of the porous polymeric membrane at a temperature of 25.degree. C.; and(B) volatile shrinking organic liquids each capable of causing the porous polymeric membrane to shrink at a shrinkage of 3% or more.Type: GrantFiled: June 25, 1982Date of Patent: December 4, 1984Assignee: Ube Industries, Ltd.Inventors: Hiroshi Makino, Yoshihiro Kusuki, Takashi Harada, Hiroshi Shimazaki, Tosio Isida
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Patent number: 4485058Abstract: Hollow water-absorbing polyester filaments each having a number of fine caves which are evenly distributed in at least a portion of the filament and through which the hollow is connected to the outside of the filament, are produced (1) by preparing hollow filaments from a blend of a principal polyester component and a cave-forming agent consisting of at least one member selected from:(i) copolyesters containing an additional divalent organic sulfonic acid compound moiety of the formula (II): ##STR1## wherein Z is a trivalent aromatic or aliphatic hydrocarbon radical, M.sup.1 is H or metal atom, R.sup.1 is an ester-forming organic radical and R.sup.2 is an H atom or ester-forming organic radical;(ii) phosphorus compounds of the formula (III): ##STR2## wherein R.sup.3 is a monovalent organic radical, X is --OR.sup.4, wherein R.sup.4 is an H atom or a monovalent organic radical, --OM.sup.3, wherein M.sup.3 is a metal atom, or a monovalent organic radical, M.sup.Type: GrantFiled: September 27, 1982Date of Patent: November 27, 1984Assignee: Teijin LimitedInventors: Togi Suzuki, Kiyokazu Tsunawaki, Osamu Wada, Akio Kimura
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Patent number: 4477300Abstract: In the manufacture of cementitious board by depositing a slurry of hydraulic cementitious material, commonly gypsum plaster, between two facing sheets and forming it to the desired width and thickness prior to setting, the formation of voids in the core, due to air trapped in the slurry is avoided by vibrating the lower sheet (10) after the slurry (15) has been deposited on it, usually before the upper sheet (14) contacts the slurry, and subsequently vibrating the upper sheet when it comes into contact with the mass of cementitious slurry. The vibration of the lower sheet, for example by rotating polygonal shaft (20), causes bubbles of unwanted trapped air to rise through the slurry towards the upper surface and the accumulated bubbles are then broken by the vibration of the upper sheet, which may be accomplished by a second rotating shaft (21), before they become incorporated into the formed board as voids.Type: GrantFiled: April 26, 1983Date of Patent: October 16, 1984Assignee: BPB Industries Public Limited CompanyInventor: Thomas A. Pilgrim
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Patent number: 4470944Abstract: The present invention relates to a process for producing an of aromatic polyimide film comprising (A) casting on a support a dope containing an amide-type polar solvent and 10-45 weight percent of a polyamic acid having more than 0.4 dl/g an inherent viscosity of more than 0.4 dl/g, (B) concentrating the polymer content to be at least higher than that of the initial dope while simultaneously raising the ring closure ratio above 30%, (C) removing the solvent from the film by extraction in an aqueous medium so as to lower the solvent content of the film below 10% and (D) then heating the film to a temperature of more than 200.degree. C.The process of the present invention is useful for the production of aromatic polyimide film having a reduced rate of solvent decomposition and improved productivity.Type: GrantFiled: February 3, 1983Date of Patent: September 11, 1984Assignee: Toray Industries, Inc.Inventors: Toshiyuki Asakura, Masanori Mizouchi, Hiroaki Kobayashi
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Patent number: 4468360Abstract: A porous diaphragm for an electrolytic cell for the electrolysis of alkali metal halides is comprised of a thermoplastic support fabric impregnated with particles of a siliceous composition. The thermoplastic support fabric has an anode side, a cathode side opposite the anode side, and a thickness of at least 0.3 millimeters. The cathode side has a greater hydrophobicity than the anode side. To provide greater hydrophobicity which results in controlled, reduced cell voltages, for example, the cathode side of the support fabric is treated with an oxidizing agent.Type: GrantFiled: December 21, 1981Date of Patent: August 28, 1984Assignee: Olin CorporationInventor: Igor V. Kadija
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Patent number: 4468434Abstract: A dyed polyester fiber composite structure having an enhanced brilliance and/or color depth, comprises (A) a dyed porous polyester fiber which has been produced (1) by preparing a polyester resin from a dicarboxylic acid component and a glycol component in the presence of a pore-forming agent containing 0.3 to 3 molar % of at least one phosphorus compound based on the molar amount of the dicarboxylic acid component, (2) by converting the polyester resin to a polyester fiber in which fine particles of the pore-forming agent are dispersed, by treating the polyester fiber with an aqueous alkali solution so that at least 2% of the weight of the fiber is removed and a number of fine pores are formed in the fiber and (4) by dyeing the porous polyester fiber; and (B) a coating layer on the peripheral surface of the dyed porous polyester fiber, comprising a polymeric material having a smaller refractive index than that of the porous polyester fiber.Type: GrantFiled: August 25, 1982Date of Patent: August 28, 1984Assignee: Teijin LimitedInventors: Masaaki Sekimoto, Norihiro Minemura, Togi Suzuki, Kiyokazu Tsunawaki
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Patent number: 4466931Abstract: The starting materials for the practice of the present invention are (1) one or more organic monomers or oligomers which upon irradiation very rapidly undergo a polymerization reaction to form a solid polymer; and (2) a liquid vehicle in which the one or more organic monomers or oligomers are soluble but in which the polymer formed is insoluble. For the manufacture of microporous membrane in accordance with the invention the monomers or oligomers are dissolved in the liquid vehicle, the resulting solution is formed into a thin layer, and the thin layer of the solution is then irradiated as with ultraviolet or electron beam radiation whereupon the rapid polymerization reaction immediately ensues and the polymer formed immediately segregates from the vehicle thereby resulting in microporous membrane from which the vehicle can be removed as by evaporation or washing.Type: GrantFiled: August 5, 1982Date of Patent: August 21, 1984Assignee: Gelman Sciences Inc.Inventor: Gerald B. Tanny
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Patent number: 4450129Abstract: A process is disclosed for making miniature doll heads. An oversized head is formed of a shrinkable plastisol including a plasticizer, and facial features are applied to the head using a shrinkable paint. Hair is rooted to the scalp of the oversized head. The head is reduced in size by extracting the plasticizer from the plastisol. During the extraction, the head and its facial features shrink simultaneously to form the miniature head.Type: GrantFiled: January 24, 1983Date of Patent: May 22, 1984Assignee: Mattel, Inc.Inventors: Ralph Dunn, Leonard R. Coleman
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Patent number: 4439389Abstract: Shapeforming acrylonitrile polymer film by providing acrylonitrile polymer aquagel film, conforming said aquagel film into the desired shape and while in said shape, heat-removing at least substantially all of the water from said aquagel film.Type: GrantFiled: December 13, 1982Date of Patent: March 27, 1984Assignee: Mobil Oil CorporationInventor: Randal J. Hasenauer
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Patent number: 4419308Abstract: A process for producing a porous, film-like or fibrous structure of an aromatic polyester, which comprises(1) forming a substantially non-oriented film-like or fibrous structure by melt-molding an aromatic polyester blend composed of(A) an aromatic polyester containing an aromatic dicarboxylic acid as a main acid component and an aliphatic diol and/or an alicyclic diol as a main glycol component, and(B) at least one low-molecular-weight compound selected from the group consisting of imide compounds and isocyanurate compounds being compatible, but substantially non-reactive, with the aromatic polyester and having a molecular weight of not more than 1,000,the amount of the low-molecular-weight compound being present in an amount of 10 to 300 parts by weight per 100 parts by weight of the aromatic polyester, and(2) extracting at least a major part of the low-molecular-weight compound from the resulting substantially non-oriented film-like or fibrous structure with an organic solvent which can dissolve the low-moType: GrantFiled: March 28, 1983Date of Patent: December 6, 1983Assignee: Teijin LimitedInventors: Shunichi Matsumura, Hiroo Inata
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Patent number: 4416934Abstract: A woven or knitted polyester multifilament fabric having a silk-like appearance and touch, comprised of polyester multifilament yarns containing one or more types of porous polyester filaments each having an irregular cross-sectional profile, for example, C-, L- or V-shaped profile, and numerous fine linear concave parts formed on the peripheral surface thereof and extending along the longitudinal axis of each individual filaments, the fabric being characterized by a group of said concave parts corresponding to a half of the entire number of the concave parts, each having a length of 5 microns or more and a ratio of the length to the width of each concave part of 5 or more.Type: GrantFiled: March 31, 1981Date of Patent: November 22, 1983Assignee: Teijin LimitedInventors: Akio Kimura, Osamu Wada, Shinji Owaki, Kozo Seimitsu
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Patent number: 4416839Abstract: A wholly aromatic polyester composition comprising(a) 100 parts by weight of a wholly aromatic polyester containing as a main component at least one compound selected from the group consisting of aromatic dicarboxylic acids, aromatic dihydroxy compounds and aromatic hydroxycarboxylic acids, and(b) from 5 to 300 parts by weight of a low-molecular-weight compound being substantially non-reactive with the wholly aromatic polyester and having a boiling point of at least about 200.degree. C. under atmospheric pressure and a molecular weight of not more than 1,000.The wholly aromatic polyester composition is produced advantageously by polycondensing in the molten state the polyester-forming starting mixture in the presence of the low-molecular-weight compound.A film-like or fibrous article of a wholly aromatic polyester may be produced by extracting the low-molecular-weight compound from a film-like or fibrous article of the wholly aromatic polyester composition.Type: GrantFiled: July 16, 1982Date of Patent: November 22, 1983Assignee: Teijin LimitedInventors: Hiroo Inata, Shunichi Matsumura
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Patent number: 4405854Abstract: A basin for simultaneous or consecutive dewaxing and curing of denture molds is disclosed. The basin is generally box-shaped and is provided with three vertically-shaped trays of which the topmost remains above the high fluid level. The upper rear portion of the basin has a pivotally-secured frame-arm provided with a plurality of nozzles adapted to spray over the entire area of the topmost tray. The fluid from the nozzles drains back into the basin; a recirculating pump recirculates the fluid back into the nozzles. A separate fluid inlet is provided to fill the basin for curing. The basin is further provided with an upper and lower fluid level-limiting means, a heating element, a thermostat and, preferably, an automatic timer.Type: GrantFiled: June 18, 1982Date of Patent: September 20, 1983Inventor: Denis Lapointe
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Patent number: 4388129Abstract: Bubble- or void-free electrical laminates such as unclad or metal clad laminates are produced by impregnating a porous fibrous substrate with a solvent-free liquid resin capable of curing to a rigid state without producing a volatile by-product, combining a plurality of impregnated substrates to form a unitary member, allowing substantially all of entrapped air bubbles retained in the combination to disappear by dissolving into the liquid resin, and then curing the combination.Type: GrantFiled: September 22, 1981Date of Patent: June 14, 1983Assignee: Kanegafuchi Kagaku Kogyo Kabushiki KaishaInventors: Masayuki Oizumi, Masaharu Abe, Yasuo Fushiki
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Patent number: 4379825Abstract: Porous toner comprises a coloring matter and a binder, said toner being formed by obtaining a powder through a step of mixing and kneading under heat a toner preparing material including a coloring matter, binder and elimination compound which neither softens or melts at a temperature at which said binder softens or melts, and by treating said powder with a solvent to remove said elimination compound.Type: GrantFiled: February 10, 1981Date of Patent: April 12, 1983Assignee: Canon Kabushiki KaishaInventor: Yasuo Mitushashi
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Patent number: 4371493Abstract: Silicone putty-like substance is made by mixing dimethyl silicone gum with a boron compound (e.g., boric acid) and a reinforcing filler, and making sheet stocks of the mixture. The sheet stocks are placed on perforated trays in a heating oven and heated at a temperature of about 350.degree. F. to about 500.degree. F. for several hours. The volatiles produced during heating (cooking) of the sheets stocks are removed from the oven by passing air through the perforated trays in order to obtain high bouncing putty which minimal amount of inferior product.Type: GrantFiled: September 2, 1980Date of Patent: February 1, 1983Inventor: Maurice A. Minuto
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Patent number: 4371485Abstract: A new and useful hydrophilic polyester fiber and process of making same are disclosed; the fiber has a stable pore system exhibiting a moisture pickup (regain) of at least about 2 percent by weight at 40.degree. C. and a relative humidity of 92%. Our experiments indicate that the proportion of moisture regain is attributable to capillary condensation in an amount of at least 25%. The hydrophilic properties are the result of a certain pore system within the fiber which enables capilliary condensation to occur significantly. The invention describes one way to accomplish this, namely by the addition of a predetermined amount of a suitable oxalato-complex to a suitable polyester mass. Most preferably, about 10% by weight K.sub.3 Al(C.sub.2 O.sub.4).sub.3 is added to the polyester mass.Type: GrantFiled: December 11, 1980Date of Patent: February 1, 1983Assignee: Akzona IncorporatedInventors: Nikolaus Mathes, Wolfgang Lange, Klaus Gerlach
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Patent number: 4371454Abstract: Spherical carbon material or a spherical activated carbon is prepared from an admixture of pitch, amorphous carbon and a viscosity-controlling agent by the process comprising the step of heating and extruding the admixture into strings, cooling and cutting the string into fragments, introducing the fragments into hot water to obtain spherical particles of the admixture, removing the viscosity-controlling agent from the spherical particles, infusibilizing the spherical particles and carbonizing the spherical particles and further activating the carbonized spherical carbon particles.Type: GrantFiled: October 29, 1980Date of Patent: February 1, 1983Assignee: Kureha Kagaku Kogyo Kabushiki KaishaInventors: Kaji Hisatsugu, Kazuhiro Watanabe
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Patent number: 4364759Abstract: Anisotropic hollow fiber membranes comprising polymer of acrylonitrile and styrene are prepared by extruding a solution of a hollow fiber-forming polymer comprising polymer of acrylonitrile and styrene in a liquid carrier through an annular spinnerette to form a hollow fiber precursor, and the hollow fiber precursor is coagulated in a liquid coagulant comprising water to form a hollow fiber membrane. The liquid carrier used in the method comprises N,N-dimethylformamide and preferably contains non-solvent for the polymer of acrylonitrile and styrene. The hollow fiber membranes have a homogeneously-formed thin selective skin on an open cellular support and exhibit high resistance to collapse. The membranes are especially useful for the separation of gases.Type: GrantFiled: February 20, 1980Date of Patent: December 21, 1982Assignee: Monsanto CompanyInventors: Albert A. Brooks, Jay M. S. Henis, Mary K. Tripodi
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Patent number: 4361617Abstract: Hollow water-absorbing polyester filaments each having a number of fine caves which are evenly distributed in at least a portion of the filament and through which the hollow is connected to the outside of the filament, are produced (1) by preparing hollow filaments from a blend of a principal polyester component and a cave-forming agent consisting of at least one member selected from:(i) copolyesters containing an additional divalent organic sulfonic acid compound moiety of the formula (II): ##STR1## wherein Z is a trivalent aromatic or aliphatic hydrocarbon radical, M.sup.1 is H or metal atom, R.sup.1 is an ester-forming organic radical and R.sup.2 is an H atom or ester-forming organic radical;(ii) phosphorus compounds of the formula (III): ##STR2## wherein R.sup.3 is a monovalent organic radical, X is --OR.sup.4, wherein R.sup.4 is an H atom or a monovalent organic radical, --OM.sup.3, wherein M.sup.3 is a metal atom, or a monovalent organic radical, M.sup.Type: GrantFiled: July 23, 1980Date of Patent: November 30, 1982Assignee: Teijin LimitedInventors: Togi Suzuki, Kiyokazu Tsunawaki, Osamu Wada, Akio Kimura
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Patent number: 4336307Abstract: Hollow water-absorbing polyester filaments, each having fine pores evenly distributed throughout the filament and extending approximately in parallel to the filament axis, are produced by melt-spinning a blend of a polyester and a pore-forming agent consisting of at least one sulfonate compound of the formula:R'SO.sub.3 M'wherein R' is an alkyl radical having 3 to 30 carbon atoms or an aryl or alkylaryl radical having 7 to 40 carbon atoms and M' is an alkali or alkaline earth metal, and by removing at least a portion of the sulfonate compound from the hollow filaments by using an alkali aqueous solution so as to cause a number of fine pores to be formed in the hollow filaments and to cause each hollow to be connected to the outside of the filament through the fine pores.Type: GrantFiled: July 14, 1980Date of Patent: June 22, 1982Assignee: Teijin LimitedInventors: Masahiro Shiozaki, Kiyoshi Nawata, Osamu Wada, Kiyokazu Tsunawaki, Takatoshi Kuratsuji, Wataru Funakoshi, Togi Suzuki
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Patent number: 4323534Abstract: The object of this invention is to provide a composition of thermoplastic rubber which can be extruded into fibers and films with exceptional strength and good elasticity. Current formulations of some thermoplastic rubbers cannot be extruded into fibers or films with the accompanying strength and elasticity.Compositions of the current invention comprise 20 to 50% by weight of one of a group of fatty acids or fatty alcohols containing from about 12 to about 24 carbon atoms and 80 to 50% by weight of a member selected from the group consisting of A-B-A block copolymers, where B is poly(ethylenebutylene) and A is a thermoplastic polymer which is phase incompatible with B.This composition of matter results in a thermoplastic rubber composition that is easily extrudable into fibers or films. Extruded fibers of the current composition can be made into elastic fabrics, elastic bands for clothing or made into nonwoven structures for use in elastic bandages or wrapping.Type: GrantFiled: December 17, 1979Date of Patent: April 6, 1982Assignee: The Procter & Gamble CompanyInventor: Thomas A. DesMarais
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Patent number: 4310593Abstract: Water absorbent articles, made from solutions of carboxylic polyelectrolytes, together with methods for their preparation, and a composition useful to make said articles are disclosed. The articles are cured and/or crosslinked with monomeric amine-epihalohydrin adducts by heating and/or removing substantially all of the solvent from the precursor composition.The absorbent articles are useful as surgical sponges, diapers, tampons, meat trays, bath mats and the like.Type: GrantFiled: December 22, 1980Date of Patent: January 12, 1982Assignee: The Dow Chemical CompanyInventor: James R. Gross
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Patent number: 4278633Abstract: A gelatin capsule is formed with an elongated portion and a bulb portion with a medicinal material therein for supply to a body through inserting the elongated portion in a body orifice. The elongated portion is treated with a hardening agent which withdraws water and/or glycerin from the elongated portion of the capsule so that the elongated portion has sufficient rigidity for insertion within the body orifice. The hardening agent can be a polymer of a glycol, which is preferably polyethylene glycol, an inorganic drying agent such as silica gel or phosphorus pentoxide, an alcohol, or a ketone, such as acetone, for example. When a polymer of a glycol is utilized as the hardening agent, the polymer of a glycol can remain on the elongated portion to function as a lubricant when the elongated portion is inserted in the body orifice. Furthermore, the polymer of a glycol can include an anesthetic for deadening the nerves around the body orifice.Type: GrantFiled: December 10, 1979Date of Patent: July 14, 1981Assignee: Stanley Drug Products, Inc.Inventor: Akira Fujii
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Patent number: 4275100Abstract: A conductive video disc replica is cleaned by washing with an aqueous solution comprising an oxidizing agent, a base and a surfactant of a fluorocarbon added in an amount so that the solution has a surface energy of about 35 dynes/cm.sup.2 or less. This solution removes metallic and oxygen-containing impurities from the surface of the disc and leaves a fluorinated surface.Type: GrantFiled: January 4, 1980Date of Patent: June 23, 1981Assignee: RCA CorporationInventor: Pabitra Datta
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Patent number: 4266999Abstract: A cannula/catheter is provided which is suitable for long term or semi-permanent through-the-skin function while permitting tissue ingrowth which promotes healing and seals out sources of infection. The catheter is provided with a sheath formed of an elastomeric coating which is glow discharge treated, folded back on itself to form a cuff and surgically implanted and anchored in place. The cuff portion of the sheath is advanced outwardly by the growth of skin adherent to its periphery while the catheter is maintained in its original position.Type: GrantFiled: July 30, 1979Date of Patent: May 12, 1981Assignee: Calspan CorporationInventor: Robert E. Baier
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Patent number: 4263843Abstract: Method and apparatus for removing excess ceramic slurry from polyurethane foam used as a matrix for ceramic material in manufacturing filters for molten metals such as aluminum. The apparatus comprises a first chamber for retaining a body of polyurethane foam impregnated with a slurry of ceramic material; a second chamber; a slurry-permeable screen between the first and second chambers; and compression means for pressing the polyurethane foam against the screen. By evacuating the second chamber and simultaneously compressing the foam against the screen, slurry is withdrawn from the foam into the second chamber while retaining in the foam an evenly distributed residue of ceramic material.Type: GrantFiled: July 30, 1979Date of Patent: April 28, 1981Assignee: Aluminum Company of AmericaInventors: Virginia L. Hammersmith, Richard G. LaBar
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Patent number: 4264676Abstract: Superfine fibers of polyvinyl alcohol type having a single fiber diameter of 0.1-1.0.mu. and a fineness of 0.8-80.times.10.sup.-4 d/f are baked in the presence of a dehydration catalyst so that the weight loss ratio of fibers falls under the range of about 5 to 40%.When ion-exchange radicals are introduced into the partially dehydrated fiber, superfine fibers with a high ion-exchange rate are obtained.Type: GrantFiled: August 16, 1979Date of Patent: April 28, 1981Assignee: Nitivy Co., Ltd.Inventors: Mitsutaka Uzumaki, Masahiko Takashio, Akihisa Shirasaka, Tadayoshi Utsumi
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Patent number: 4260577Abstract: An improved process for the production of rubber hydrochloride sheet is described in which a rubber sheet is advanced through a reaction zone essentially in one direction while totally immersed in a solution of hydrogen chloride in an organic solvent capable of swelling the rubber, flotation of the rubber sheet in the reaction solution being prevented, and the slack in the sheet caused by the initial swelling thereof being taken up to keep the sheet in substantially fully extended form to prevent it from contacting itself while in tacky condition, washing the sheet with an organic solvent or mixture thereof capable of removing the entrained, unreacted hydrogen chloride and other contaminants, drying the sheet in air at about 60.degree. C. to 80.degree. C., and calendering the still warm sheet to a finished rubber hydrochloride sheet of uniform thickness; the preferred solvent for both the hydrochlorination and washing operations being ethyl acetate.Type: GrantFiled: November 5, 1979Date of Patent: April 7, 1981Assignee: Takayoshi NarisueInventor: Yoshio Yasuoka
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Patent number: 4259281Abstract: A process for reducing micro-voids in cross-linked cable insulation without reducing the voltage breakdown strength thereof in which process the insulation, after cross-linking, is heated at a temperature in the range from about 120.degree. C. to about 150.degree. C. and under a pressure less than 10 mm. Hg for a period from about 8 hours to 48 hours. Also, a cable having such insulation which has micro-voids less than about 10.sup.2 per mm.sup.3 and a perforation gradient greater than the perforation gradient of a cable which has not been so treated.Type: GrantFiled: April 17, 1979Date of Patent: March 31, 1981Assignee: Industrie Pirelli S.p.A.Inventors: Gianmario Lanfranconi, Bernardino Vecellio
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Patent number: 4254182Abstract: A polyester fiber having an irregularly uneven random surface, having nonuniform recesses and projections forming said surface satisfying the requirement 0.2 micron<X<0.7 micron where X is the planar distance from the deepest point of a recess to the deepest point of another recess located adjacently thereof in the circumferential direction perpendicular to the fiber axis and being present at the density of 10 to 50 in each planar distance of 10 microns in the circumferential direction perpendicular to the fiber axis. Said recesses and projections constituting the random surface have additional microfine recesses and projections within the size range of 50 to 200 millimicrons. A method for producing a polyester synthetic fiber having the above surface structure is also described. The fiber thus obtained features excellent dyeability, i.e. the development and depth of color, and an excellent surface hand.Type: GrantFiled: March 2, 1979Date of Patent: March 3, 1981Assignee: Kuraray Co., Ltd.Inventors: Shinji Yamaguchi, Takao Akagi, Takaakira Tsuji, Katsura Maeda, Masao Kawamoto, Akira Kubotsu
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Patent number: 4238434Abstract: A method of producing a silicon carbide sintered body is disclosed. The sintered body having a density of at least 2.4 g/cm.sup.3 is produced by preparing a mixture consisting mainly of silicon carbide with an average particle size of not more than 3.0 microns and a temporary binder, shaping the mixture into a green body and sintering the green body at a temperature of 1,750.degree. C.-2,100.degree. C. Before the sintering, silicon carbide is contacted with either hydrofluoric acid or anhydrous hydrofluoric acid and an atmosphere is held in a non-oxidizing state after the contact treatment up to the completion of the sintering.Type: GrantFiled: February 2, 1979Date of Patent: December 9, 1980Assignee: Ibigawa Electric Industry Co., Ltd.Inventors: Ryo Enomoto, Hiroyuki Tanaka, Kazuhisa Hara
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Patent number: 4219517Abstract: A dense hollow fiber cellulosic membrane which possesses outstanding permeability and strength characteristics and the method of preparation thereof is disclosed.Type: GrantFiled: October 12, 1978Date of Patent: August 26, 1980Assignee: Puropore Inc.Inventor: Robert E. Kesting
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Patent number: 4185058Abstract: The invention relates to hydrophilic fibers and filaments with good coloring response to dyes from filament-forming hydrophobic synthetic polymers having a sheath-core structure with a highly microporous core and a substantially compact sheath and having a water retention capacity of at least 10% wherein the pores in the core have an average pore diameter measured in the direction of the cross-section of the fiber, of at most 4000 A. The invention relates also to a process for the production of those filaments and fibers according to a dry-spinning process wherein a spinning solution is spun below the boiling point of the spinning solvent used.Type: GrantFiled: February 13, 1978Date of Patent: January 22, 1980Assignee: Bayer AktiengesellschaftInventors: Ulrich Reinehr, Toni Herbertz, Hermann-Josef Jungverdorben
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Patent number: 4177235Abstract: A composition comprising .alpha.-alumina in a concentration of at least 99.95 weight percent and process for producing such .alpha.-alumina wherein alumina having an alkali metal content between 0.05 and 0.60 weight percent and Al.sub.2 O.sub.3 content of more than 95 weight percent is electrically fused with silica and additional alkali, if desired, in an electric arc furnace, the heated composition is cooled, comminuted and the so-formed glass phase is removed from an alumina containing phase by mechanical or chemical means.Type: GrantFiled: December 14, 1977Date of Patent: December 4, 1979Assignee: Dynamit Nobel AktiengesellschaftInventors: Manfred Neidhardt, Gerhard Rehfeld
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Patent number: 4141941Abstract: Producing from a single contact lens casting mold, lenses of a number of different sizes by including in the casting precursor for each lens, a controlled amount of an extractable diluent of low volatility which is extracted after casting to cause the resulting lens to shrink a calculable amount. Variations in amounts are used to produce corresponding variations in sizes of cast and extracted lenses.Type: GrantFiled: September 21, 1977Date of Patent: February 27, 1979Assignee: American Optical CorporationInventor: Edward A. Travnicek
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Patent number: 4138525Abstract: Fibers having a high degree of flexibility and handleability are produced by oxidizing fibers spun from a carbonaceous pitch which has been transformed, in part, to a liquid crystal or so-called "mesophase" state to an oxygen content of from 17 per cent by weight to 30 per cent by weight. Because of their strength and handleability, these highly-oxidized fibers can be easily processed at high speeds by means of conventional yarn-transport systems, and readily woven or knit into cloth. Such cloth may then be heat treated to produce carbon or graphite cloth.Type: GrantFiled: May 4, 1977Date of Patent: February 6, 1979Assignee: Union Carbide CorporationInventor: David A. Schulz
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Patent number: 4120098Abstract: Process for drying a water-wet permselective membrane by contacting the membrane with water replacement liquid under conditions which result in minimal shrinkage based on the surface tension, viscosity, concentration, molar volume, and temperature of the components of the system.Type: GrantFiled: June 22, 1976Date of Patent: October 17, 1978Assignee: E. I. Du Pont de Nemours and CompanyInventor: Philip Manos
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Patent number: 4116892Abstract: There is disclosed a novel process and product produced thereby for the selective stretching of incremental portions of a substrate of a synthetic thermoplastic material selected from the group consisting of a thermoplastic orientable polymer or a blend of a thermoplastic orientable copolymer in which there is admixed an incompatible second phase selected the group consisting of an incompatible polymer or inorganic material. The substrate is stretched in grooved roller pairs by controlling the velocity of introduction of the substrate to maintain the velocity substantially identical to the surface velocity of the roller pair. Stretching of the blends produce an opaque, low density porous sheet.Type: GrantFiled: September 17, 1975Date of Patent: September 26, 1978Assignee: Biax-Fiberfilm CorporationInventor: Eckhard C. A. Schwarz
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Patent number: 4115492Abstract: Normally hydrophobic, polyethylene hollow fibers having contiguous microporosity are prepared by extruding a heated solution of a polyethylene and an ester from a hollow fiber spinnerette, simultaneously cooling and drawing the forming fibers to a ratio of up to 40 to 1, drawing the gelled fibers to an overall ratio of from about 1.5/1 to 800/1 and then removing the ester. The maximum pore radius ranges up to about 50A, and the fibers have gas permeabilities approaching 10.sup.-2 cc (STP) per cm.sup.2 per second per cm. Hg. transmembrane pressure differential. A significant increase in permeability over polyethylene hollow fibers made according to the teachings of the prior art is achieved.Type: GrantFiled: January 28, 1977Date of Patent: September 19, 1978Assignee: The Dow Chemical CompanyInventors: Robert D. Mahoney, Stephen E. Schneider
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Patent number: 4107384Abstract: Porous fibers which are much preferred for having various functionalities such as ion exchangeability, catalytic activity, etc. can be produced by impregnating a mixed monomer liquid of at least one monovinyl monomer and at least one polyvinyl monomer which contains a polymerization initiator in substrate fibers capable of being swollen by 30 - 500 volume % with the mixed monomer liquid, polymerizing the monomers in the state of being absorbed in the fibers and then removing said substrate fibers.Type: GrantFiled: August 10, 1976Date of Patent: August 15, 1978Assignee: Mitsubishi Rayon Co., Ltd.Inventors: Morito Musha, Tokuhisa Miyamatsu
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Patent number: 4107254Abstract: A method of lining a pipe with settable material including the steps of arranging the pipe with its longitudinal axis inclined at an angle to the horizontal, introducing a selected amount of liquid material into the pipe at a predetermined rate so that the liquid material flows down along the pipe, shifting the pipe to a horizontal position and spinning the pipe about its axis to distribute the material, spinning continuing until the material has set. The method is particularly applicable for lining pipes with polyurethane. For pipes with end flanges end faces of the lining material can be formed integral with the lining.Type: GrantFiled: October 16, 1975Date of Patent: August 15, 1978Assignee: English Clay Lovering Pochin & Co. Ltd.Inventors: John David Webster, Thomas John Jewell
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Patent number: 4101623Abstract: A method of lining a pipe with thermosetting synthetic plastics material including the steps of arranging the pipe with its longitudinal axis inclined at an acute angle to the horizontal, introducing liquid lining material into the pipe at a predetermined rate for a predetermined time, shifting the pipe to a horizontal position shortly before or at the completion of introduction of the liquid material, spinning the pipe about its axis and blowing hot air axially through the pipe after spinning has started but before the lining material has set thereby to remove entrained air bubbles. The method is particularly applicable for lining pipes with polyurethane, especially pipes with end flanges and covers to form an end face of the lining material.Type: GrantFiled: November 11, 1975Date of Patent: July 18, 1978Assignee: English Clays Lovering Pochin & Co. Ltd.Inventors: John David Webster, Anthony Austin Wilkinson, Frederick George Tucker
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Patent number: 4080744Abstract: Process for drying a water-wet permselective membrane by initially contacting the membrane with water replacement liquid having low surface tension and limited solubility for water.Type: GrantFiled: June 22, 1976Date of Patent: March 28, 1978Assignee: E. I. Du Pont de Nemours and CompanyInventor: Philip Manos
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Patent number: 4080743Abstract: Process for drying a water-wet membrane by contacting with a solution of water miscible and water immiscible solvents and then removing the solution.Type: GrantFiled: June 22, 1976Date of Patent: March 28, 1978Assignee: E. I. Du Pont de Nemours and CompanyInventor: Philip Manos
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Patent number: 4076779Abstract: A method of restoring the fluid permeability of the surface of the mold face of a used, ceramic, fluid-release mold body which has become fouled with accumulated silicate material from the plastic clay composition formed by the mold, comprising treating the fouled surface with a fluorine containing acid such as fluosilicic acid, or hydrofluoric acid.Type: GrantFiled: August 1, 1975Date of Patent: February 28, 1978Assignee: Wallace-Murray CorporationInventor: Rudolph A. Skriletz
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Patent number: 4076673Abstract: Water swellable absorbent articles, made from solutions of carboxylic polyelectrolytes, together with methods for their preparation, and a composition useful to make said articles are disclosed. The articles are cured and/or crosslinked with polyamide-polyamine epichlorohydrin adducts by heating and/or removing subsantially all of the solvent from the precursor composition.The absorbent articles are useful as surgical sponges, diapers, tampons, meat trays, bath mats and the like.Type: GrantFiled: September 27, 1976Date of Patent: February 28, 1978Assignee: The Dow Chemical CompanyInventor: Nelson D. Burkholder, Jr.