Patents by Inventor Tsukusa Yamada

Tsukusa Yamada 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).

  • Process for producing tolterodine
    Patent number: 7268257
    Abstract: The present invention provides a process for producing tolterodine of the formula (1) or its salt, which comprises a step reacting a compound of the formula (2) with a base to obtain a reaction product; a step reacting the reaction product with a compound of the formula (3) to obtain a compound of the formula (4); and a step eliminating the protective group from the compound of the formula (4), and also provides a process for producing the compound of the formula (3).
    Type: Grant
    Filed: May 31, 2006
    Date of Patent: September 11, 2007
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Tsukusa Yamada, Nobushige Itaya, Masahide Tanaka