Patents by Inventor Keizaburo Ogawa

Keizaburo Ogawa 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).

  • Sustained release pharmaceutical tablet of theophylline and production process thereof
    Patent number: 4692337
    Abstract: A sustained release pharmaceutical tablet comprising theophylline and ethyl cellulose uniformly dispersed therein in an amount of 5 to 200 parts by weight of ethyl cellulose based on 100 parts by weight of the theophylline, the hardness of the tablet being 0.5 to 16.0 kg. This sustained release pharmaceutical tablet can be prepared by uniformly mixing 100 parts by weight of theophylline and 5 to 200 parts by weight of ethyl cellulose, and compression molding the resultant mixture by a direct compression method to form a tablet.
    Type: Grant
    Filed: September 28, 1984
    Date of Patent: September 8, 1987
    Assignee: Nikken Chemicals Co., Ltd.
    Inventors: Tadashi Ukigaya, Keizaburo Ogawa
  • Theophylline sustained release granule
    Patent number: 4261970
    Abstract: A Theophylline sustained release granule comprises 10 to 45 wt. % of Theophylline, 30 to 60 wt. % of a metal salt of higher fatty acid and 0.5 to 10 wt. % of ethyl cellulose at a ratio of 1:1 to 1:3 by weight of Theophylline to said metal salt of higher fatty acid.The Theophylline sustained release granule is effective for maintaining a suitable concentration of Theophylline in blood for a long time.
    Type: Grant
    Filed: January 2, 1980
    Date of Patent: April 14, 1981
    Assignee: Nikken Chemicals Co., Ltd.
    Inventors: Keizaburo Ogawa, Tadashi Ukigaya, Satoru Tanaka