Patents by Inventor Hideyuki Kuwakara

Hideyuki Kuwakara 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).

  • Calcium-phosphate type hydroxyapatite
    Patent number: 5217699
    Abstract: A calcium-phosphate type hydroxyapatite for chromatographic separation is in the form of spherulites having a mean particle diameter of 0.5 to 50 .mu.m, preferably 1 to 10 .mu.m. The spherulites are each an aggregate mainly of acicular crystallites belonging to a series of hexagonal systems and having unit lattice constants of 9.58.+-.0.08 .ANG. for the a axis and 7.00.+-.0.05 .ANG. for the c axis. The hydroxyapatite is produced by granulating a calcium=phosphate type hydroxyapatite in the form of a gel and then firing the granular apatite at 400.degree. to 700.degree. C., preferably at 500.degree. to 600.degree. C. The firing is performed by heating the granules in the presence of oxygen or air for a given period of time.
    Type: Grant
    Filed: July 17, 1991
    Date of Patent: June 8, 1993
    Assignees: Toa Nenryo Kogyo Kabushiki Kaisha, Ashaikogaku Kogyo Kabushiki Kaisha
    Inventors: Nobuaki Tagaya, Hideyuki Kuwakara, Takao Hashimoto, Noriko Komatsu, Keiko Fukamachi, Tsugio Maeshima, Toshihiro Ishikawa, Tetsuro Ogawa