Patents by Inventor Takashi Mitamura

Takashi Mitamura 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).

  • Pollucite crystalline powders with low thermal expansion coefficients and methods for their preparation
    Patent number: 5204077
    Abstract: A pollucite powder consisting essentially of a pollucite phase and having an Al.sub.2 O.sub.3 /SiO.sub.2 molar ratio of from 0.21 to 0.25 and a Cs.sub.2 O/SiO.sub.2 molar ratio of from 0.19 to 0.22.
    Type: Grant
    Filed: September 16, 1991
    Date of Patent: April 20, 1993
    Assignee: Tosoh Corporation
    Inventors: Toshiyuki Mori, Hiroshi Yamamura, Takashi Mitamura, Hidehiko Kobayashi
  • Preparation method for zircon powder
    Patent number: 5032556
    Abstract: A preparation method for zircon powder, which comprises heating a feed powder mixture comprising:(1) silica and zirconia obtained by subjecting a liquid having a pH of not higher than 8 and containing silica and zirconia in a SiO.sub.2 /ZrO.sub.2 molar ratio of substantially 1/1, to liquid-removing treatment, and(2) zircon in an amount of at least 0.1% by weight based on the total amount of said silica and zirconia,at a heating rate of not higher than 5.degree. C./min from 1,200.degree. C. to a calcination temperature, and maintaining it at a calcination temperature of from 1,300.degree. to 1,700.degree. C. for from 1.0 to 24 hours.
    Type: Grant
    Filed: February 20, 1990
    Date of Patent: July 16, 1991
    Assignee: Tosoh Corporation
    Inventors: Toshiyuki Mori, Yoshitaka Kubota, Takashi Mitamura, Hidehiko Kobayashi
  • Process for isolation and purification of cephalosporin compound
    Patent number: 4145539
    Abstract: A process for the isolation and purification of cephalosporin from a solution containing impurities which includes treating the solution with macroporous non-ionic adsorption resin to adsorb the cephalosporin thereto and then eluting the cephalosporin from the resin with an aqueous solution of anionic surface active agent.
    Type: Grant
    Filed: April 15, 1977
    Date of Patent: March 20, 1979
    Assignee: Fujisawa Pharmaceutical Co., Ltd.
    Inventors: Kiyoshi Hattori, Takashi Mitamura