Patents Examined by W. Thompson
  • Process and apparatus for the manufacture of objects of crystalline polystyrene
    Patent number: 4409173
    Abstract: Crystalline polystyrene is thermoformed by extruding molten material into a temperature controlled roller press having press rollers and draw rollers separated by a support roller. The buildup of sheet between the support and draw roller is controlled. The edges of the sheet are heated and then gripped by a first set of sprockets and a second set positioned past the thermoforming device. The gripped sheet passes through a heating device where both sides of the sheet are heated before the intermittent action of the press.
    Type: Grant
    Filed: November 9, 1981
    Date of Patent: October 11, 1983
    Assignee: O.M.V. SpA
    Inventor: Pietro Padovani
  • Carbonitride coated composite silicon nitride cutting tools
    Patent number: 4409004
    Abstract: Cutting tools and cutting tool inserts having improved mechanical and chemical wear resistance under demanding conditions of machining speed, temperature, or workpiece hardness comprise a composite silicon nitride substrate having at least one hard adherent coating layer of a refractory metal carbonitride. The composite silicon nitride substrate body consists essentially of particles of a refractory material uniformly distributed in a matrix consisting essentially of a first phase of silicon nitride and a refractory second phase comprising silicon nitride and an effective amount of a densification aid selected from the group consisting of yttrium oxide, hafnium oxide, the lanthanide rare earth oxides, and mixtures thereof.
    Type: Grant
    Filed: May 20, 1982
    Date of Patent: October 11, 1983
    Assignee: GTE Laboratories Incorporated
    Inventors: Vinod K. Sarin, Sergej-Tomislav Buljan, Charles D'Angelo
  • Nitride coated composite silicon nitride cutting tools
    Patent number: 4406667
    Abstract: Cutting tools and cutting tool inserts having improved mechanical and chemical wear resistance under demanding conditions of machining speed, temperature, or workpiece hardness comprise a composite silicon nitride substrate having at least one hard adherent coating layer of a refractory metal nitride. The composite silicon nitride substrate body consists essentially of particles of a refractory material uniformly distributed in a matrix consisting essentially of a first phase of silicon nitride and a refractory second phase comprising silicon nitride and an effective amount of a densification aid selected from the group consisting of yttrium oxide, hafnium oxide, the lanthanide rare earth oxides, and mixtures thereof.
    Type: Grant
    Filed: May 20, 1982
    Date of Patent: September 27, 1983
    Assignee: GTE Laboratories Incorporated
    Inventors: Vinod K. Sarin, Sergej-Tomislav Buljan, Charles D'Angelo
  • Carbonitride coated composite modified silicon aluminum oxynitride cutting tools
    Patent number: 4406669
    Abstract: Coated abrasion resistant composite ceramic cutting tools comprise a composite substrate body consisting essentially of a particulate material selected from the group consisting of the refractory metal carbides, nitrides, carbonitrides and combinations thereof uniformly distributed in a matrix, coated with at least one adherent coating layer comprising a refractory metal carbonitride. The particulate material is of an average particle size ranging between about 0.5 microns to about 20 microns and comprises from about 5 to about 60 volume percent of the composite cutting tool. The matrix consists essentially of a modified silicon aluminum oxynitride having about 2 to about 25 volume percent of a modifier selected from the oxides of silicon, yttrium, magnesium, hafnium, zirconium, beryllium, the lanthanides and combinations thereof.
    Type: Grant
    Filed: May 20, 1982
    Date of Patent: September 27, 1983
    Assignee: GTE Laboratories Incorporated
    Inventors: Vinod K. Sarin, Sergej-Tomislav Buljan
  • Nitride coated composite modified silicon aluminum oxynitride cutting tools
    Patent number: 4406670
    Abstract: Coated abrasion resistant composite ceramic cutting tools comprise a composite substrate body consisting essentially of a particulate material selected from the group consisting of the refractory metal carbides, nitrides, carbonitrides and combinations thereof uniformly distributed in a matrix, coated with at least one adherent coating layer comprising a refractory metal nitride. The particulate material is of an average particle size ranging between about 0.5 microns to about 20 microns and comprises from about 5 to about 60 volume percent of the composite cutting tool. The matrix consists essentially of a modified silicon aluminum oxynitride having about 2 to about 25 volume percent of a modifier selected from the oxides of silicon, yttrium, magnesium, hafnium, zirconium, beryllium, the lanthanides and combinations thereof, and a silicon aluminum oxynitride.
    Type: Grant
    Filed: May 20, 1982
    Date of Patent: September 27, 1983
    Assignee: GTE Laboratories Incorporated
    Inventors: Vinod K. Sarin, Sergej-Tomislav Buljan
  • Nitride coated silicon nitride cutting tools
    Patent number: 4406668
    Abstract: Cutting tools and cutting tool inserts having improved mechanical and chemical wear resistance under demanding conditions of machining speed, temperature, or workpiece hardness comprise a silicon nitride substrate body having at least one hard, adherent coating layer of a refractory metal nitride. The silicon nitride substrate body consists essentially of a first phase of silicon nitride and a refractory second phase comprising silicon nitride and an effective amount of a densification aid selected from the group consisting of silicon dioxide, aluminum oxide, magnesium oxide, yttrium oxide, hafnium oxide, zirconium oxide, the lanthanide rare earth oxides, and mixtures thereof.
    Type: Grant
    Filed: May 20, 1982
    Date of Patent: September 27, 1983
    Assignee: GTE Laboratories Incorporated
    Inventors: Vinod K. Sarin, Sergej-Tomislav Buljan
  • Process for the production of patterned tiles from thermoplastic synthetic resins
    Patent number: 4405539
    Abstract: A process for the production of patterned tiles from thermoplastic synthetic resins includes the steps of forming a length of crude sheet stock by compressing unicolored and/or differently colored or multicolored particulate material of thermoplastic synthetic resin; cutting off crude sheets from the sheet stock; punching segments out of the crude sheets; combining the segments from at least two crude sheets of differing colors into a panel so that the segments complement one another, and thereafter press-molding the segments to form an intarsia tile with the use of pressure and heat so that the segments are welded together along joints formed therebetween.
    Type: Grant
    Filed: November 10, 1981
    Date of Patent: September 20, 1983
    Assignee: Dynamit Nobel Aktiengesellschaft
    Inventors: Herbert Schulte, Hans Brinkmann, Uwe Sommermeyer
  • Microwave heating process for grinding wheels
    Patent number: 4404003
    Abstract: A method for making low porosity resin bonded product containing abrasive grams by preheating the abrasive grain mix prior to pressing and curing to a temperature within a range to just soften or partially liquidy the resin and which does not cure it. The heating is done with dielectric heating field and then the heated mix is cold pressed in a mould to the desired density, and the resin heat cured to produce the finished product.
    Type: Grant
    Filed: October 16, 1981
    Date of Patent: September 13, 1983
    Assignee: Norton Company
    Inventor: Denis I. Harris
  • Method of press forming of plastic material
    Patent number: 4402901
    Abstract: A method of press forming plastic material by a press having upper and lower moulds, in which melt plastic material is extruded from an extruder and is supplied to a metering chamber. The metering chamber supplies a metered amount of material into a movable arm which moves over the mould surface area of the lower mould and injects the material from an injection port of the arm, while the arm is moving. By suitably controlling the movement of the arm and material supply from the metering chamber, a desired charge pattern formed by a parapet shaped injected material can be formed. Automatic programming by a microprocessing unit is also easy.
    Type: Grant
    Filed: April 2, 1981
    Date of Patent: September 6, 1983
    Assignee: Yamakawa Industrial Co., Ltd.
    Inventors: Koji Emura, Tuneo Suzaki, Koji Takai, Hidemichi Kazama
  • Method and apparatus for making a composite carbon material
    Patent number: 4399083
    Abstract: A method of and an apparatus for making a composite carbon material from a precompact of granular carbons of different kinds or origins. A localized region of the carbon precompact is subjected to simultaneous heating by electric current flow from a current source at a temperature of 1800.degree. to 3500.degree. C. and pressurization at a pressure of 500 to 5000 kg/cm.sup.2, both being applied preferably impulsively. The localized region subjected to the simultaneous heating and pressurization is displaced so as to be controlledly crystallized and to control the formation of crystalline vacancies therein.
    Type: Grant
    Filed: September 16, 1981
    Date of Patent: August 16, 1983
    Assignee: Inoue-Japax Research Incorporated
    Inventor: Kiyoshi Inoue
  • Method of producing glazed ceramic substrate
    Patent number: 4399089
    Abstract: A method of producing a glazed ceramic substrate, which is useful for a hybrid integrated circuit or a thermal head of a thermal printer for instance, by applying a glass onto a major surface of a ceramic substrate, firing the substrate to form a molten glass layer on the substrate surface and cooling the fired substrate. To obtain the glazed ceramic substrate with high flatness despite the tendency of the substrate to warp due to difference in thermal expansion coefficient between the ceramic and the glass, a refractory base which supports the substrate during the firing and cooling steps is so shaped as to allow the substrate to deform during the firing step reversely to the expected warp at the cooling step, so that the warp at the cooling step is offset by the preceding deformation. For example, the upper surface of the base is shaped into a continuous and concave surface.
    Type: Grant
    Filed: January 7, 1982
    Date of Patent: August 16, 1983
    Assignee: Central Glass Company, Limited
    Inventors: Yoshio Mohri, Tsutomu Ikeda, Takashi Hiroishi, Kinzi Sano, Yasuhiro Yamamoto, Yuji Yamamoto, Ryoji Nakashima
  • Method for the production of cementitious compositions and aggregate derivatives from said compositions, and cementitious compositions and aggregates produced thereby
    Patent number: 4397801
    Abstract: The present invention relates to a method for preparing synthetic shaped cementitious compositions having high quality even without the addition of high energy binders, such as portland cement, through the use of the spent residue from a fluidized combustion bed of the type wherein limestone particles are suspended in a fluidized medium and sulfur oxides are captured, and pulverized coal fly ash.
    Type: Grant
    Filed: February 9, 1981
    Date of Patent: August 9, 1983
    Inventor: L. John Minnick
  • Method for producing a filter
    Patent number: 4396565
    Abstract: A method for producing a filter having partially different apparent densities comprises the steps of assembling at least two kinds of foamed bodies having different cell densities, which are formed of an organic compound such as urethane, into a three dimensional structure, immersing the obtained composite body into a slurry composed of ceramic such as cordierite so that the slurry is attached to the surface of the composite body, and firing the composite body to which the slurry is attached, to burn off the foamed bodies. By selecting the portion to be formed into high density, mechanical strength and exhaust gas purifying efficiency of the filter can be improved.
    Type: Grant
    Filed: August 20, 1981
    Date of Patent: August 2, 1983
    Assignee: Nippon Soken, Inc.
    Inventors: Masahiro Tomita, Masao Wakayama
  • Method for the manufacture of granular grit for use as abrasives
    Patent number: 4393021
    Abstract: A pasty mix of granular grits, binder and filler is pressed through a sieve web by rolling action to form cylindrical, worm-like extrusions. After hardening in a heating duct the extrusions are subjected to the same action and thereby granular grit particles are formed each of which contains several grits.The apparatus for carrying out the method includes a sieve web which co-operates with a rotor having several freely rotatable rollers around its periphery.
    Type: Grant
    Filed: June 9, 1981
    Date of Patent: July 12, 1983
    Assignee: Vereinigte Schmirgel und Maschinen-Fabriken AG
    Inventors: Gustav Eisenberg, Gunter Bigorajski
  • Ceramic arc tube of metal vapor discharge lamps and a method of producing the same
    Patent number: 4387067
    Abstract: The disclosed ceramic arc tube of metal vapor discharge lamps has an arc discharge portion with electrode-holding end portions integrally formed at opposite ends thereof. The outside diameter of the arc discharge portion is larger than that of the electrode-holding end portions. The ceramic arc tube is made by placing a tubular green body in a fusiform cavity of a die, inflating the middle portion of the green body more than end portions thereof, and firing the thus shaped green body.
    Type: Grant
    Filed: January 29, 1981
    Date of Patent: June 7, 1983
    Assignee: NGK Insulators, Ltd.
    Inventors: Kazuo Kobayashi, Mamoru Furuta, Yoshio Maeno
  • Method of forming a cup-like container
    Patent number: 4386044
    Abstract: A method of making a one-piece container of heat shrinkable thermoplastic foam from sheet stock in which a longitudinally seamed cylindrical sleeve made from such material is placed on a forming mandrel providing the essential shape of the container. An end portion of the sleeve extends cantilever fashion beyond the mandrel. The sleeve is heated to soften it and shrink partially to conformity of the mandrel and shrink to a small elongate tube a fraction of the sleeve's original diameter. The heat softened sleeve is pressed against the bottom end of the mandrel to form a container bottom, and at the same time the other opposite end of the sleeve is upset to form a bead for the container opposite the bottom end.
    Type: Grant
    Filed: July 2, 1981
    Date of Patent: May 31, 1983
    Assignee: Owens-Illinois, Inc.
    Inventors: Carl Arndt, Martin Mueller
  • Preheated extruder
    Patent number: 4385883
    Abstract: An extruder for thermoplastic or elastomeric materials has a mastication stage with one or more feedscrews preceded by a preheating zone in which the incoming bulk material is circulated and possibly recirculated by two screw-type conveyor members or augers in a loop within a heated extension of the extruder housing. The augers may be counterrotatingly disposed in two juxtaposed cylindrical compartments or may be coaxially nested and corotating with opposite pitch.
    Type: Grant
    Filed: September 3, 1980
    Date of Patent: May 31, 1983
    Assignee: American Maplan Corporation
    Inventor: Wilhelm Hanslik
  • Process for preparing biaxially oriented films of butene-1 homopolymer and copolymers
    Patent number: 4385022
    Abstract: A process for making a film of butene-1 homopolymer and copolymers of improved strength and clarity and the film made thereby. Such a film is produced by quenching an extruded poly(butene-1) homopolymer or copolymer while in the amorphous state, preferably at temperatures below O.degree. C., and biaxially stretching the quenched film before substantial crystallization occurs. Subsequent heat setting of the film at a temperature above the stretching temperature, but below its melting point, produces a heat stable film of high break strength and clarity, suitable as a food wrap or food container overwrapping material.
    Type: Grant
    Filed: May 18, 1981
    Date of Patent: May 24, 1983
    Assignee: Mobil Oil Corporation
    Inventor: Charles L. Rohn
  • Method and apparatus for producing multi-layer expanded films
    Patent number: 4383968
    Abstract: Method and apparatus for forming multi-layer expanded film. A base film extruded by a die is coated, immediately downstream of the die mouth, by a further layer of fluid propelled from a manifold through a metering orifice. The combination of manifold and metering orifice is necessary to permit accurate control of the flow rate of the fluid and hence of the thickness of the coating, and the mouth of the die and the metering orifice must be very close so that the base film is as resistant as possible to deflection by the impact of the coating fluid, and so that contact takes place before any substantially expansion has taken place. The downstream end of the resulting multi-layer tubular film is then held closed in known fashion and the closed tube is expanded by air under pressure admitted by an opening in the die.
    Type: Grant
    Filed: June 22, 1981
    Date of Patent: May 17, 1983
    Assignee: National Research Development Corporation
    Inventors: Stephen H. Joseph, John E. Miller, Lawrie A. Williamson
  • Automatic finishing chip process
    Patent number: 4383967
    Abstract: A method of producing finishing chips comprising the steps of providing a castable mixture of particulate abrasive grains and a solidifiable matrix, depositing the mixture into cavities of a generally-cylindrical, flexible mold having a plurality of cavities in the interior surface thereof conforming to the desired configuration of finishing chips to be produced, rotating said cylindrical mold during solidification of said mixture and the production of solid finishing chips within said cavities, and ejecting said solidified finishing chips from said mold by bringing said mold to an inside-out position, whereby said solidified finishing chips are ejected from said cavities, is disclosed.
    Type: Grant
    Filed: July 1, 1982
    Date of Patent: May 17, 1983
    Assignee: Roto-Finish Company, Inc.
    Inventor: Gunther W. Balz