Patents by Inventor Keisuke Ohdoi

Keisuke Ohdoi 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).

  • Pyridine type thiazolidines
    Patent number: 5955481
    Abstract: The present invention provides novel pyridine type thiazolidines and their salts, expressed by the following formula (I): ##STR1##
    Type: Grant
    Filed: February 4, 1998
    Date of Patent: September 21, 1999
    Assignee: Nissan Chemical Industries, Ltd.
    Inventors: Yoshio Ohara, Mikio Suzuki, Nobuhide Miyachi, Katsuhiro Kato, Keisuke Ohdoi, Tetsuya Kobayashi, Ken-ichi Shikada, Takeshi Naito, Takashi Yotsumoto
  • Pyranobenzoxadiazole derivatives
    Patent number: 5272271
    Abstract: A compound of the formula (I): ##STR1## wherein X.sup.1 and X.sup.2 do not exist or represent oxygen atom; A represents OH or acyloxy group having 1 to 4 carbon atoms; B represents hydrogen atom; A and B together represent a bond; R.sup.1 and R.sup.2 represent hydrogen atom or alkyl group having 1 to 4 carbon atoms, or R.sup.1 and R.sup.2 together represent 1,2-ethylene, 1,3-propylene, 1,4-butylene or 1,5-pentylene, and these alkylene groups may be substituted by alkyl group having 1 to 4 carbon atoms; R.sup.3 represents amido group of the formula: ##STR2## wherein n, R.sup.4, R.sup.5, R.sup.6, R.sup.7. R.sup.8. R.sup.9, R.sup.10 and R.sup.11 represent specific groups, and the pharmacological acceptable salts of the compounds which can form salts have strong activity for lowering blood pressure, and process therefor and pharmaceutical use of the compounds.
    Type: Grant
    Filed: July 8, 1991
    Date of Patent: December 21, 1993
    Assignee: Nissan Chemical Industries, Ltd.
    Inventors: Kiyotomo Seto, Hiroo Matsumoto, Yoshimasa Kamikawaji, Kazuhiko Ohrai, Keisuke Ohdoi, Ryozo Sakoda, Yukinori Masuda