Patents by Inventor Akitoshi Imura

Akitoshi Imura 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).

  • Tetracalcium phosphate-based materials and processes for their preparation
    Patent number: 5652016
    Abstract: The invention provides (i) a process for preparing tetracalcium phosphate particles, the process comprising the steps of (1) sintering or fusing a powder mixture at a temperature of not lower than 1,400.degree. C., the mixture comprising a powder of calcium source and a powder of phosphorus source in a Ca/P molar ratio of 2/1, and about 0.005 to about 5 parts of an aluminum compound, calculated as Al.sub.2 O.sub.
    Type: Grant
    Filed: April 2, 1996
    Date of Patent: July 29, 1997
    Assignee: Osaka Cement Co., Ltd.
    Inventors: Akitoshi Imura, Toru Saito, Shiro Ikegami
  • Tetracalcium phosphate-based materials and processes for their preparation
    Patent number: 5569490
    Abstract: The invention provides (i) a process for preparing tetracalcium phosphate particles, the process comprising the steps of (1) sintering or fusing a powder mixture at a temperature of not lower than 1,400.degree. C., the mixture comprising a powder of calcium source and a powder of phosphorus source in a Ca/P molar ratio of 2/1, and about 0.005 to about 5 parts of an aluminum compound, calculated as Al.sub.2 O.sub.
    Type: Grant
    Filed: June 2, 1995
    Date of Patent: October 29, 1996
    Assignee: Osaka Cement Co., Ltd.
    Inventors: Akitoshi Imura, Toru Saito, Shiro Ikegami
  • Tetracalcium phosphate-based materials and processes for their preparation
    Patent number: 5536575
    Abstract: The invention provides (i) a process for preparing tetracalcium phosphate particles, the process comprising the steps of (1) sintering or fusing a powder mixture at a temperature of not lower than 1,400.degree. C., the mixture comprising a powder of calcium source and a powder of phosphorus source in a Ca/P molar ratio of 2/1, and about 0.005 to about 5 parts of an aluminum compound, calculated as Al.sub.2 O.sub.
    Type: Grant
    Filed: December 21, 1994
    Date of Patent: July 16, 1996
    Assignee: Osaka Cement Co., Ltd.
    Inventors: Akitoshi Imura, Toru Saito, Shiro Ikegami
  • Tetracalcium phosphate-based materials and process for their preparation
    Patent number: 5409982
    Abstract: Tetracalcium phosphate particles are prepared by sintering or fusing at a temperature of at least 1,400.degree. C. a mixture of a powder of calcium source and a powder of phosphorous source in a Ca/P molar ratio of 2:1 and about 0.05 to about 5 parts of aluminum compound per 1 parts of tetracalcium phosphate to be produced in terms of the theoretical amount and finely-dividing the product obtained.
    Type: Grant
    Filed: June 9, 1993
    Date of Patent: April 25, 1995
    Assignee: Osaka Cement Co. Ltd.
    Inventors: Akitoshi Imura, Toru Saito, Shiro Ikegami