Patents by Inventor Yasuhiko Hirayama

Yasuhiko Hirayama 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).

  • Apatite coated article and process for producing the same
    Patent number: 5128146
    Abstract: An apatite coated article comprising a substrate having thereon an apatite layer which is formed by flame spraying apatite powder at from about 2,000.degree. to 4,000.degree. C., and a process for producing such an apatite coated article.
    Type: Grant
    Filed: November 13, 1991
    Date of Patent: July 7, 1992
    Assignee: Asahi Kogaku Kogyo K.K.
    Inventors: Yasuhiko Hirayama, Haruko Ikata, Satoshi Ojima
  • Method for producing calcium phosphate-based material
    Patent number: 5089195
    Abstract: A method for producing a calcium phosphate-based material comprising:(a) molding a calcium phosphate powder;(b) preliminarily calcining the resulting molding in a vacuum or under a reduced pressure until the relative density is 95% or more; and(c) firing the molding in air, an inert gas, or nitrogen gas.
    Type: Grant
    Filed: June 22, 1990
    Date of Patent: February 18, 1992
    Assignee: Asahi Kogaku Kogyo K.K.
    Inventors: Takeshi Ichitsuka, Yasuhiko Hirayama, Tetsuro Ogawa
  • Process for producing calcium phosphate ceramics having porous surface
    Patent number: 5017518
    Abstract: A process for producing calcium phosphate ceramics having a porous surface is described, which comprise the steps of:a) preparing untreated calcium phosphate ceramics, which comprises a mixture of hydroxyapatite and tricalcium phosphate, andb) treating said untreated ceramics with an acidic solution to selectively dissolve the tricalcium phosphate in the surface of the ceramics.
    Type: Grant
    Filed: April 18, 1990
    Date of Patent: May 21, 1991
    Assignee: Asahi Kogaku Kogyo K.K.
    Inventors: Yasuhiko Hirayama, Tetsuro Ogawa, Satoshi Ojima
  • Method for producing calcium phosphate-based material
    Patent number: 4957674
    Abstract: A method for producing a calcium phosphate-based material comprising:(a) molding a calcium phosphate powder;(b) preliminarily calcining the resulting molding in a vacuum or under a reduced pressure until the relative density is 95% or more; and(c) firing the molding in air, an inert gas, or nitrogen gas.
    Type: Grant
    Filed: May 11, 1988
    Date of Patent: September 18, 1990
    Assignee: Asahi Kogaku Kogyo Kabushiki Kaisha
    Inventors: Takeshi Ichitsuka, Yasuhiko Hirayama, Tetsuro Ogawa
  • Artificial intervertebral disc
    Patent number: 4946378
    Abstract: An artificial intervertebral disc comprises a pair of end bodies which are provided, on their outer surfaces, with apatite layers. The disc includes a medical synthetic polymeric intermediate which is held between the end bodies through connecting members.
    Type: Grant
    Filed: November 22, 1988
    Date of Patent: August 7, 1990
    Assignee: Asahi Kogaku Kogyo Kabushiki Kaisha
    Inventors: Yasuhiko Hirayama, Haruko Ikata, Satoshi Ojima, Hiromi Matsuzaki
  • Support for biomedical implant device
    Patent number: 4798585
    Abstract: A support for a biomedical implant device in which the support has a surface layer composed of a biocompatible calcium phosphate material such as sintered hydroxyapatite with a porosity of 50-60% and pore size of 0.5-500 micrometers. Preferably, the surface layer is formed with projections or recesses of a few hundred micrometers size.
    Type: Grant
    Filed: June 8, 1987
    Date of Patent: January 17, 1989
    Assignee: Asahi Kogaku Kogyo Kabushiki Kaisha
    Inventors: Masahide Inoue, Takeshi Ichitsuka, Yasuhiko Hirayama, Shozo Koshikawa, Tateki Kitaoka, Nobuo Nakabayashi, Tatsumichi Takeda, Osamu Minoo
  • Support for biomedical implant device
    Patent number: RE34037
    Abstract: A support for a biomedical implant device in which the support has a surface layer composed of a biocompatible calcium phosphate material such as sintered hydroxyapatite with a porosity of 50-60% and pore size of 0.5-500 micrometers. Preferably, the surface layer is formed with projections or recesses of a few hundred micrometers size.
    Type: Grant
    Filed: January 17, 1991
    Date of Patent: August 18, 1992
    Assignee: Asahi Kogaku Kogyo K.K.
    Inventors: Masahide Inoue, Takeshi Ichitsuka, Yasuhiko Hirayama, Shozo Koshikawa, Tateki Kitaoka, Nobuo Nakabayashi, Tatsumichi Takeda, Osamu Minoo