Patents Examined by James H. Derrington
  • Patent number: 4814127
    Abstract: A method of producing a reinforced ceramic which includes a step of aggregating ceramic fibrous material of 0.5 .mu.m or more in diameter; a composite step in which the fiber aggregate obtained is placed on a filter and a dispersion liquid in which ceramic powder having a particle size of not more than one-tenth of the diameter of the ceramic fibrous material is dispersed in a dispersion medium is transferred through the fiber aggregate from a side opposite to the filter to the other side, for passing the dispersion medium through said filter and introducing the ceramic powder in a gap between the fibrous material of the fiber aggregate to form a composite of the fibrous material and the ceramic powder; and a step of sintering the composite.
    Type: Grant
    Filed: March 31, 1987
    Date of Patent: March 21, 1989
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventor: Tatsuo Toyoda
  • Patent number: 4521367
    Abstract: An article having a flange is molded between a mold core and a unitary mold cavity, the flange being formed during the process as a consequence of the existence of an undercut existing in a first surface of the cavity. A ridge is provided on a second surface of the mold cavity adjacent the undercut. A fluid, i.e., air, is injected between the cavity and the molded article as the core and cavity separate in such a volume and at such a pressure as will maintain the article in substantially complete and constant contact with the core as the core and article are withdrawn from the cavity. The flange conforms to the cavity wall until the article is free from the cavity, and subsequently the molded article is separated from the mold core.
    Type: Grant
    Filed: November 16, 1981
    Date of Patent: June 4, 1985
    Inventor: J. Larry Underwood
  • Patent number: 4518398
    Abstract: A sintered ceramic body for cutting tools having a residual porosity of not exceeding 0.2% by volume and mean crystal grain size of not exceeding 2.mu. is obtained by sintering a mixture substantially consisting of 70-95% by volume alumina and the balance of titanium nitride and Zr-containing component(s) such as Zr, ZrC and/or ZrN wherein the volumetric ratio of TiN/Zr-containing component(s) ranges 95/5-50/50 under the pressure application of 50-3000 Kg/cm.sup.2. The sintering may be carried out by hot pressing or HIP process.
    Type: Grant
    Filed: July 18, 1980
    Date of Patent: May 21, 1985
    Inventors: Hiroshi Tanaka, Yoshihiro Yamamoto
  • Patent number: 4479769
    Abstract: The method for producing articles from thermosetting resins, more particularly articles having a complex, variable shape such as spectacle frames, comprising bottom casting liquid thermosetting resin into a mold and causing the resin to set in a field of centrifugal force.
    Type: Grant
    Filed: March 24, 1981
    Date of Patent: October 30, 1984
    Assignee: Safilo S.p.A.
    Inventor: Francesco Simioni
  • Patent number: 4478776
    Abstract: A method of making a thin, flexible, pliable matrix material for a molten carbonate fuel cell is described. The method comprises admixing particles inert in the molten carbonate environment with an organic polymer binder and ceramic particle. The composition is applied to a mold surface and dried, and the formed compliant matrix material removed.
    Type: Grant
    Filed: September 30, 1981
    Date of Patent: October 23, 1984
    Inventors: Donald L. Maricle, Gary C. Putnam, Robert C. Stewart, Jr.
  • Patent number: 4476083
    Abstract: The following specification describes a stop boss formed on the handle of a pail by means of a pair of slides located behind a skirt wall of the pail with the handle passing through a slot in the skirt wall, which is closed by a flange wall formed by the slides. The slides are movably carried in guides by a ring member and are received in a recess of another ring member which conventionally forms the annular pail wall. The guides enable the slides to move laterally toward each other in response to downward movement of the carrying ring member, to define the cavities for forming the stop boss and the flange wall closing the skirt wall slot. On completion of the mold cycle and upward movement of the ring member carrying the slides, the guides move the slides laterally apart to release the stop boss and the flange wall. The slides are then moved from between the skirt and pail walls to enable the pail to be released from the mold.
    Type: Grant
    Filed: February 16, 1978
    Date of Patent: October 9, 1984
    Inventor: John W. von Holdt
  • Patent number: 4474718
    Abstract: A non-linear voltage limiting device displaying a particular stability characteristic and designed to eliminate flashover failure across its circumferential edge is disclosed herein along with a specific method of fabrication. The voltage limiting device is characterized by a rising resistive current with time at predetermined temperature and voltage levels and includes a disc-shaped wafer composed primarily of zinc oxide. In accordance with the method disclosed herein, after this wafer is formed and sintered in accordance with prescribed temperature and time requirements, its circumferential edge is provided with an anti-flashover coating which requires curing. Thereafter, the coated wafer is annealed in a way which cures the coating and, at the same time, reduces and preferably minimizes the resistive current rise characteristic referred to above.
    Type: Grant
    Filed: July 27, 1981
    Date of Patent: October 2, 1984
    Assignee: Electric Power Research Institute
    Inventors: Douglas M. Mattox, Tapan K. Gupta, William G. Carlson, Shih M. Ho
  • Patent number: 4474603
    Abstract: A method of producing a taconite pellet including reducing the water content of naturally found Gyttja to a maximum of 50%, mixing the Gyttja with finely ground taconite ore, and pelletizing the finely ground taconite and Gyttja mixture to form a green pellet. The pellet is then processed to burn off the organic portion of the Gyttja and to harden the pellet.
    Type: Grant
    Filed: September 24, 1982
    Date of Patent: October 2, 1984
    Inventor: Marty K. Vadis
  • Patent number: 4472336
    Abstract: A method of manufacturing capacitance video discs comprising thermoplastic resins and conductive carbon black, wherein said conductive carbon black having an average primary particle size of 25 millimicrons or less is washed by water or an inorganic acid, heated at temperatures of 400.degree. to 1,200.degree. C. in a non-oxidizing atmosphere and wherein the coarse particles having a grain size of 0.05 mm or more are substantially eliminated. This method can provide video discs having reduced surface defects and stability after a moisture-proof test.
    Type: Grant
    Filed: April 16, 1982
    Date of Patent: September 18, 1984
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yoshio Enoki, Kazuhisa Morimoto
  • Patent number: 4472339
    Abstract: A cheese mold of polyolefin material having a non-woven inner layer of polyolefin fibers which is heat welded to the mold surface is disclosed. A method for manufacturing the mold is also provided. A non-woven layer of fibers is provided and a liquid mass of plastic is heat sealed thereto by extrusion or injection molding.
    Type: Grant
    Filed: September 27, 1982
    Date of Patent: September 18, 1984
    Assignee: B.V. Hollandse Plastic Industrie Rotterdam
    Inventors: Dirk C. H. van der Ploeg, Marinus H. Vellekoop, Hendrik Palte
  • Patent number: 4472338
    Abstract: A method of producing polyamide foils by extrusion wherein a dispersion of a solid inorganic nucleating agent is added to the polyamide.
    Type: Grant
    Filed: April 5, 1982
    Date of Patent: September 18, 1984
    Assignee: Bayer Aktiengesellschaft
    Inventors: Karl H. Hermann, Helmut Schulte, Werner Nielinger, Dietrich Michael
  • Patent number: 4470939
    Abstract: An electrode for an electrochemical cell is formed by blending an electrochemically active compound with a conductive material, forming the blend into a plurality of agglomerates, admixing the agglomerates with a second conductive material which may be the same as or different from the first conductive material and compressing the resulting mixture. The method is particularly useful for forming cathodes containing a mercury compound, since such cathodes have greatly enhanced abilities to immobilize free mercury during cell discharge.
    Type: Grant
    Filed: September 25, 1980
    Date of Patent: September 11, 1984
    Assignee: Duracell Inc.
    Inventor: Robert J. Schoolcraft
  • Patent number: 4469476
    Abstract: Wafers are produced by guiding a sheet of bread having friable outer crusts and a relatively soft center through wafer forming apparatus. The apparatus includes a pair of rolls, one of said rolls, i.e., a cutting roll having one or more wafer forming recesses or cavities therein and the other roll being a pressure roll which operates in rolling engagement with the cutting roll. As the sheet of bread is introduced into the nip formed between the two rolls the pressure roll acts to press the bread into the cavity or cavities on the cutting roll and into engagement with the edges of the cavity or cavities to cut wafers from the sheet of bread. Each cavity is configured to have a bottom surface which rises as a gradually tapering wall to a cutting edge which is coterminious with the surface of the cutting roll.
    Type: Grant
    Filed: April 6, 1979
    Date of Patent: September 4, 1984
    Assignee: Cavanagh & Sons, Inc.
    Inventors: John F. Cavanagh, Paul A. Cavanagh
  • Patent number: 4468190
    Abstract: A mold for synthetic resin products which are to be shaped while soft, includes a pair of elongated mold parts each having opposed complementary faces with contours at least partially conforming to at least parts of the product to be shaped. A support means on which the mold parts are mounted provide for moving at least one of the mold parts relative to the other mold part to effect removal therefrom of a finished product. The mold parts are constructed and arranged so as to be bendable along their longitudinal axes to effect a change in arcuate configuration, the mold parts being made of a material which facilitates sliding of the synthetic resin product through the mold, the support means supporting the mold parts in fixed spaced apart disposition as the product is moved longitudinally between the mold parts to thereby impart to the product an arcuate configuration corresponding to the arcuate configuration of the mold parts.
    Type: Grant
    Filed: June 2, 1981
    Date of Patent: August 28, 1984
    Assignee: Maschinen Witte KG
    Inventor: Karl H. Witte
  • Patent number: 4468473
    Abstract: Protoenstatite ceramic units are prepared by compressing units of a mixture of 55 to 80 parts by weight of uncalcined demagnetized asbestos tailings with 22 to 44 parts by weight of a source of silica and from 0 to 17 parts by weight of fluxing agents and firing the units at 1250.degree. to 1500.degree. C.
    Type: Grant
    Filed: August 27, 1982
    Date of Patent: August 28, 1984
    Assignee: Societe Nationale de Liamiante
    Inventors: Jean P. Drolet, Jean P. Chevalier
  • Patent number: 4466850
    Abstract: A one-time electrically-activated switch is composed of a cured polymeric binder which contains a powdered conductive material in an amount sufficient to establish particle-to-particle contact throughout the binder and in which the material powder particles have a non-conductive oxide surface sufficient to resist the flow of electricity below a given threshold. When a sufficiently high voltage is applied to the switch, the break-down voltage of the oxide layer is exceeded and avalanche current is permitted to flow. As a result, the oxide layer on the conductive particles breaks down along the break-down path and forms an irreversible low-impedance connection.
    Type: Grant
    Filed: January 24, 1983
    Date of Patent: August 21, 1984
    Assignee: General Electric Company
    Inventors: Charles W. Eichelberger, Robert J. Wojnarowski
  • Patent number: 4467077
    Abstract: Mica filled polyolefin resin composites exhibit improved mechanical properties if the mica filler and polyolefin resin are specially combined with additives comprising chlorinated aliphatic compounds. The composites are preferably made from blends comprising about 1-36 parts by weight mica flakes (especially phlogopite mica), 9 parts by weight propylene resin and minor effective amounts of the additive. Various processing techniques such as selecting the time the blends reside at melt temperatures during compounding permits development of advantageous properties.
    Type: Grant
    Filed: March 2, 1981
    Date of Patent: August 21, 1984
    Assignee: Ford Motor Company
    Inventors: Fred J. Meyer, Seymour Newman
  • Patent number: 4467043
    Abstract: The invention relates to dense shaped articles of polycrystalline .alpha.-silicon carbide containing from 0.1 to 0.4%, by weight, of aluminum and optionally, a small amount of nitrogen and/or phosphorus, having a homogeneous virtually single-phase microstructure. The additional constituents are substantially in the form of a solid solution in the .alpha.-SiC lattice. The shaped articles are distinguished by flexural strength of at least 600 N/mm.sup.2 up to 1450.degree. C. and low subcritical crack propagation under mechanical stress. The fracture mechanism is trans granular up to at least 1450.degree. C. The shaped articles are manufactured by simultaneously shaping and hot pressing pulverulent .alpha.-silicon carbide containing a small amount of an aluminum-containing additive, such as aluminum powder, aluminum nitride and/or aluminum phosphide, at temperatures between 1850.degree. C. and 2300.degree. C. under a pressure of at least 100 bar (10 MPa).
    Type: Grant
    Filed: June 23, 1983
    Date of Patent: August 21, 1984
    Assignee: Elektroschmelzwerk Kempten GmbH
    Inventors: Jochen Kriegesmann, Alfred Lipp, Klaus Reinmuth
  • Patent number: 4464324
    Abstract: The invention relates to a device and method of using the device and plastic injection molding processes. A mold is provided utilizing a core inside the injection cavity of the mold. The core is prior to insertion of the mold subjected to a sub-freezing atmosphere. The core is then placed in the mold cavity wherein is injected the plastic material to mold the plastic part substantially surrounding the core. A thin film of air is formed around the "core" at the time of the injection of the plastic material thereby providing a substantial increase in surface finish to the plastic molded part. The core is made from a material which when heated will melt prior to the melting of the plastic part so that the core and part are removed from the cavity and subjected to a heating step thereby enabling removal of the core from the part.
    Type: Grant
    Filed: September 21, 1981
    Date of Patent: August 7, 1984
    Assignee: Ozen
    Inventor: Daniel Hager
  • Patent number: RE31725
    Abstract: A fused abrasive grain, useful for inclusion in coated abrasives and bonded abrasives, consists essentially of alumina; titanium oxide containing from about 0.42 to about 0.84% titaniun, by weight of the abrasive grain, present as a reduced titanium oxide having an average oxidation state lower than in Ti.sub.2 O.sub.3 ; from about 0.05 to about 0.3% by weight carbon; from about 0.02 to about 0.1% by weight Na.sub.2 O; and from 0 to about 0.1% by weight total of calcium and silicon oxides. The grain before roasting has a gain on ignition of from about 0.4 to about 0.7% by weight, and is produced in an electric furnace by fusing high-purity titania, alumina containing Na.sub.2 O as the only significant oxide impurity, and carbon, followed by crushing and roasting the fused grain.
    Type: Grant
    Filed: September 2, 1980
    Date of Patent: November 6, 1984
    Assignee: Kennecott Corporation
    Inventors: Thomas B. Walker, Robert J. Seider, Paul Cichy