Patents by Inventor Masaki Ichikawa

Masaki Ichikawa 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).

  • Vinylbenzene derivatives
    Patent number: 6329547
    Abstract: The present invention provides compounds represented by the following general formula [I] and salts thereof, which are useful as therapeutic agents for glaucoma, wherein R1 is H, lower alkyl or phenyl, and the phenyl can be substituted by lower alkyl, hydroxy, lower alkoxy, halogen, nitro or phenyl; R2 and R3, being the same or different, are H, halogen or lower alkyl; R4 and R5, being the same or different, are H, lower alkyl or carboxyl or ester thereof; and R6 is carboxyl or phosphono or ester thereof.
    Type: Grant
    Filed: November 22, 2000
    Date of Patent: December 11, 2001
    Assignee: Santen Pharmaceutical Co., Ltd.
    Inventors: Eiichi Shirasawa, Koji Konomi, Masaki Ichikawa, Hiroshi Suhara
  • Separation agent for optical isomers
    Patent number: 5030354
    Abstract: A separating agent comprising ovomucoid and a carrier is useful to separate an optical isomer from a racemoid by way of chromatography.
    Type: Grant
    Filed: August 18, 1989
    Date of Patent: July 9, 1991
    Assignee: Eisai Co., Ltd.
    Inventors: Toshinobu Miwa, Teiichi Hattori, Masanori Tsuno, Masaki Ichikawa, Takeshi Miyakawa, Yasuo Miyake
  • Granule remaining in stomach
    Patent number: 4844905
    Abstract: A granule of drug to remain in the stomach comprises a core comprising a pharmaceutically effective ingredient, a foaming layer coated on said core and an expansive film coated on said layer.
    Type: Grant
    Filed: February 12, 1987
    Date of Patent: July 4, 1989
    Assignee: Eisai Co., Ltd.
    Inventors: Masaki Ichikawa, Sumio Watanabe, Yasuo Miyake