Patents by Inventor Koichi Okita

Koichi Okita 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: 4230758
    Abstract: A fluorine resin coated aluminum structure comprising:(a) an aluminum substrate with a roughened surface;(b) a coating of aluminum oxide formed on the surface of the aluminum substrate; and(c) a baked coating of a fluorine resin firmly bonded to the aluminum oxide coating, the fluorine resin coating having a thickness of about 5 to about 100 microns and a surface roughness represented by an R.sub.max value of about 5 to about 60 (.mu.) and an R.sub.z value of about 4 to about 50 (.mu.). This aluminum structure is especially useful as a material for cookware because of its superior anti-stick and low friction characteristics and the good adhesion of the resin coating to the substrate.
    Type: Grant
    Filed: August 6, 1979
    Date of Patent: October 28, 1980
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Shuzo Nagai, Seiji Watabe, Takao Ogino, Koichi Okita
  • Patent number: 4225547
    Abstract: This application relates to a paste extrusion process using a ram type extruder wherein at least one, preferably both, of the die and mandrel of the extruder are rotated, in opposite directions when both are rotated. In preferred embodiments, the material being extruded is polytetrafluoroethylene, the mandrel has a smooth surface and the end portion of the die is heated.
    Type: Grant
    Filed: September 22, 1978
    Date of Patent: September 30, 1980
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Koichi Okita
  • Patent number: 4208745
    Abstract: A vascular prosthesis comprising a tubing of porous polytetrafluoroethylene, the polytetrafluoroethylene tubing having a fibrous structure of nodes and fibers connecting the nodes together and having a structure in which the fibrous structure at the inside surface of the tubing is finer than the fibrous structure at the outside surface of the tubing.
    Type: Grant
    Filed: August 4, 1977
    Date of Patent: June 24, 1980
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Koichi Okita
  • Patent number: 4193138
    Abstract: A composite structure vascular prosthesis comprising a porous polytetrafluoroethylene tube in which the pores of the porous polytetrafluoroethylene tube are filled with at least one water-insolubilized water-soluble polymer, and a process for producing the composite structure vascular prosthesis.
    Type: Grant
    Filed: August 17, 1977
    Date of Patent: March 18, 1980
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Koichi Okita
  • Patent number: 4177334
    Abstract: Polytetrafluoroethylene resin tubes having small pore size and high porosity are produced by a process which includes stretching the tubes by drawing using a metal die and a metal plug. By using the die and plug, the stress necessary for stretching is converted to a compressive force in the thickness direction of the tube. This compressive force is an essential factor in producing the microporous structure of the tubes. In addition, when stretching is performed by drawing, a ratio of thickness to inside diameter of the tube of 0.07 or less can be easily achieved.
    Type: Grant
    Filed: September 12, 1977
    Date of Patent: December 4, 1979
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Koichi Okita
  • Patent number: 4113912
    Abstract: A hydrophilic porous structure comprising a porous fluorocarbon resin structure with the pores of the fluorocarbon resin structure containing at least one water-insolubilized water-soluble polymer and a process for the production thereof.
    Type: Grant
    Filed: August 10, 1977
    Date of Patent: September 12, 1978
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Koichi Okita
  • Patent number: 4104394
    Abstract: An unsintered tube of extruded ptfe resin is heated above its melting temperature of 327.degree. C, a positive pressure is established within the tube relative to the external pressure thereon to radially expand it, and the pressure is maintained until the tube is cooled below its melting point and set. Such a tube demonstrates superior strength and crack resistance when it is thereafter radially contracted around a core member by reheating, and its longitudinal shrinkage is minimized.
    Type: Grant
    Filed: December 14, 1976
    Date of Patent: August 1, 1978
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Koichi Okita
  • Patent number: 4082893
    Abstract: A porous polytetrafluoroethylene tubing, useful as artificial internal organs or industrial filtering materials for, for example reverse osmosis, ultrafilteration, etc., having a microporous fibrous structure in which the fibrous structure is composed of fibers and nodes connected with each other and the microporous fibrous structure differs between the outer surface portions of the tubing and the inner surface portions of the tubing, and a process for producing the porous resin tubing comprising heating a tubing made of an unsintered polytetrafluoroethylene under conditions in which the tube is stretched at least in the longitudinal direction of the tubing and such that the outer surface of the tubing is heated above about 327.degree. C and the inner surface of the tubing is heated to a temperature below the temperature of the outer surface.
    Type: Grant
    Filed: December 17, 1976
    Date of Patent: April 4, 1978
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Koichi Okita