Patents by Inventor Tetsu Kitami

Tetsu Kitami has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6079466
    Abstract: A method for preventing air permeation from a pneumatic tire wherein there is arranged inside the tire an air permeation preventive layer formed of a thermoplastic resin film produced by mixing and extruding at least two thermoplastic resins which are incompatible with each other, the film having a matrix phase of a first of the resins in which there is dispersed a dispersed phase having an oriented lamellar structure and formed of a second of the resins, wherein the ratio of melt viscosity of the second resin to that of the first resin at the molding temperature of the incompatible thermoplastic resins is preferably 1.5 to 20.
    Type: Grant
    Filed: March 13, 1996
    Date of Patent: June 27, 2000
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Jiro Watanabe, Tetsu Kitami
  • Patent number: 5804269
    Abstract: A hose useful for handling low temperature fluids such as refrigerants is disclosed, which exhibits excellent resistance to ozone and moisture permeation. A cover or outermost tube of the hose is formed from a vulcanizate of a rubber composition comprising a first copolymer rubber having an isobutylene unit and a p-halogenated methylstyrene unit and/or a second copolymer rubber having an isobutylene unit, a p-halogenated methylstyrene unit and a p-methylstyrene unit.
    Type: Grant
    Filed: May 5, 1992
    Date of Patent: September 8, 1998
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Osamu Ozawa, Tetsu Kitami
  • Patent number: 5393844
    Abstract: Rubber compositions having high tensile modulus at 100% and strong metal adhesion. The rubber compositions include chlorinated polyethylene rubber and/or its derivative reformed with maleic anhydride with from 0.2 to 10 parts by weight per 100 parts of the rubber of a 2,4,6-trimercapto-1,3,5-triazine dicyclohexylamine salt.
    Type: Grant
    Filed: June 21, 1993
    Date of Patent: February 28, 1995
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Osamu Ozawa, Tetsu Kitami
  • Patent number: 5380571
    Abstract: A hose including at least an inner tube, a reinforcing layer and an outer cover, wherein the inner tube and the outer cover are individually composed of a thermoplastic elastomer comprising a vulcanized rubber dispersed in a thermoplastic resin, M.sub.p defined by the following formula (I) is not greater than 70 kgf/cm.sup.2, and flexural rigidity of the hose at a bending radius four times the outer diameter of the hose is 1 kgf or less: ##EQU1## wherein t.sub.1 and t.sub.2 are the thickness of the inner tube and the outer tube (mm), respectively, and M.sub.1 and M.sub.2 are stress (kgf/cm.sup.2) at 25% elongation of the inner tube and the outer cover, respectively.
    Type: Grant
    Filed: June 17, 1993
    Date of Patent: January 10, 1995
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Osamu Ozawa, Hiroyuki Miyade, Tetsu Kitami
  • Patent number: 5362530
    Abstract: A composite hose is disclosed which is constructed essentially with an inner tube and an outer cover, the inner tube being formed from a composition comprised of a specified polymer alloy of a selected class of polyamide resins and acrylic rubbers and the outer cover from a composition comprised of a specified thermoplastic elastomer of a selected class of polyolefin resins and ethylene-propylene-diene rubbers and butyl-based rubber. Impermeability is greatly improved with respect to refrigerant gases and fuel oils.
    Type: Grant
    Filed: December 9, 1993
    Date of Patent: November 8, 1994
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Tetsu Kitami, Osamu Ozawa, Jun Mito
  • Patent number: 5319035
    Abstract: Rubber compositions are disclosed which are formulated to provide high modulus at 100% and strong adhesion to metal. Chlorinated polyethylene rubber and/or its derivative reformed with maleic anhydride is blended with specified amounts of a 2-mercaptobenzothiazole dicyclohexylamine salt, trithiocyanuric acid and sufur such that formulae (1) and (2) are met ##EQU1## where phr is defined as the amount in parts of the component per hundred parts of component (A) or component (B) or both.
    Type: Grant
    Filed: May 9, 1991
    Date of Patent: June 7, 1994
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Osamu Ozawa, Tetsu Kitami
  • Patent number: 5297337
    Abstract: Rubber compositions are disclosed for integral attachment of polymeric and metallic materials. Improved bondability is attributed to the use of a selected base rubber blended with a selected class of inorganic or organic fillers, silane compounds and vulcanizing agents such that the finished composition is provided with a specified range of Mooney viscosities. Also disclosed is a method of hose-metal fitting connection by the application of the composition. Gas- and oil-impermeability characteristics are greatly enhanced.
    Type: Grant
    Filed: June 9, 1992
    Date of Patent: March 29, 1994
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Shigeru Igarashi, Osamu Ozawa, Tetsu Kitami
  • Patent number: 5149732
    Abstract: Rubber compositions are disclosed for integral attachment of polymeric and metallic materials. Improved bondability is attributed to the use of a selected base rubber blended with a selected class of inorganic or organic fillers, silane compounds and vulcanizing agents such that the finished composition is provided with a specified range of Mooney viscosities. Also disclosed is a method of hose-metal fitting connection by the application of the composition. Gas- and oil-impermeability characteristics are greatly enhanced.
    Type: Grant
    Filed: March 6, 1990
    Date of Patent: September 22, 1992
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Shigeru Igarashi, Osamu Ozawa, Tetsu Kitami
  • Patent number: 4950436
    Abstract: A process is disclosed for producing a composite hose constructed with a core tube, a reinforcement layer and a cover laminated one on another, the core being made up of a resin inner wall and a rubber outer wall. Gas impermeability and flexibility are enhanced by formation of the inner wall on a mandrel of selected synthetic material and specified bending strength.
    Type: Grant
    Filed: April 20, 1989
    Date of Patent: August 21, 1990
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Tetsu Kitami, Jun Mito, Tutomu Suyama
  • Patent number: 4905736
    Abstract: Hoses for transporting or otherwise handling refrigerant and oil fluids are disclosed which are comprised of an inner tube, an outer cover and a reinforcing layer interposed therebetween. The inner tube includes at least two walls, one being an inner resinous wall and the other being an outer rubbery wall having specified moduli at 100%. The outer cover is formed by a selected class of rubbers having a higher modulus at 100% than the outer wall of the inner tube. The resulting hose is securely interconnectable with metal fittings, highly impermeable to gaseous and oily fluids, sufficiently resistant to stress cracking and adequately flexible.
    Type: Grant
    Filed: June 1, 1988
    Date of Patent: March 6, 1990
    Assignee: Yokohama Rubber Co., Ltd.
    Inventors: Tetsu Kitami, Jun Mito, Toyotaka Narita
  • Patent number: 4881576
    Abstract: A hose for refrigerant fluid or fuel oil service which comprises a core tube, a reinforcing layer and an outer cover, the core tube being of a composite structure having an inner plastic peripheral wall, an intermediate plastic peripheral wall and an outer rubbery peripheral wall. The inner and intermediate walls are formed of a selected class of polyamides and polyolefins, whereby the hose is rendered highly impermeable to fluid and moisture, greatly resistant to stress cracking and sufficiently flexible.
    Type: Grant
    Filed: December 11, 1987
    Date of Patent: November 21, 1989
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Tetsu Kitami, Jun Mito
  • Patent number: 4880036
    Abstract: A hose for transporting or otherwise handling refrigerants is disclosed which comprises an inner tube, an outer cover and a reinforcing layer disposed therebetween, the inner tube including a resinous inner wall and a rubbery outer peripheral wall. The inner peripheral wall is formed by a selected class of polymers having specified compositions, whereby the hose is rendered highly resistant to gas permeation and stress cracking and highly flexible and moisture-proofing.
    Type: Grant
    Filed: November 10, 1987
    Date of Patent: November 14, 1989
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Tetsu Kitami, Jun Mito
  • Patent number: 4862923
    Abstract: A hose for auomotive air-conditioning, transporting or otherwise handling refrigerants is disclosed which comprises an inner and an outer cover and a reinforcement disposed therebetween, the inner tube including an inner and an outer peripheral wall and a polyamide layer laminated therebetween. The inner and outer peripheral walls have a specified range of elasticity, and the polyamide layer has a specified thickness, whereby the hose is rendered highly resistant to heat, moisture-permeation and refrigerant-permeable, and flexible, and further free of damage from creeps or cracks from dynamic fatigue in the vicinity of metal fitting applied on the hose.
    Type: Grant
    Filed: June 2, 1986
    Date of Patent: September 5, 1989
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Tetsu Kitami, Jun Mito
  • Patent number: 4826925
    Abstract: Rubber compositions are disclosed which are characterized by enhanced adhesion to hydrogenated acrylonitrile-butadiene rubbers and to metallic and fibrous materials, and also be improved modulus at 100% elongation, and hence are suitable particularly for use in tires, belts, molded articles, rubber rolls and hoses. Such physical characteristics are obtained by the use of specified amounts of a selected class of sulfurs, organic peroxides and triazine compounds combined with selected sulfur-curable base rubbers.
    Type: Grant
    Filed: July 13, 1987
    Date of Patent: May 2, 1989
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Osamu Ozawa, Tetsu Kitami
  • Patent number: 4802938
    Abstract: A process for producing hoses of laminated construction having a plastic inner tube is disclosed which comprises:- (a) extruding a thermoplastic resin on a mandrel to form an inner tube with a predetermined thickness, the mandrel being preformed of a thermoplastic resin or rubber and releasable from the inner tube, (b) laminating an outer tube integrally on the inner tube by extrusion of an unvulcanized rubber to form an integral hose body, (c) vulcanizing the hose body, (d) removing the mandrel from the vulcanized hose body. This hose is characterized by high resistance to load of impulse.
    Type: Grant
    Filed: August 11, 1987
    Date of Patent: February 7, 1989
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Tetsu Kitami, Shigeru Igarashi, Katuya Ono