Patents by Inventor Takagi

Takagi 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).

  • Pyrido[1,2-a]pyrimidinone derivatives
    Patent number: 3960863
    Abstract: 3-[2-(4-PHENYL-1-PIPERAZINYL)ETHYL]-4H-pyrido[1,2-a]pyrimidin-4-one derivatives have central nervous depressant and hypotensive activities and are useful as major tranquillizers.The compounds can be prepared by (a) reacting 2-methyl-3-halogeno (or arylsulfonyloxy or alkylsulfonyloxy)ethyl-4H-pyrido[1,2-a]pyrimidin-4-one derivative with 1-phenylpiperazine derivative or (b) reacting an aminopyridine with 2-[2-(4-phenyl-1-piperazinyl)ethyl]-acetoacetic acid ester.
    Type: Grant
    Filed: June 5, 1975
    Date of Patent: June 1, 1976
    Assignee: Sankyo Company Limited
    Inventors: Yasunobu Sato, Hiroshi Fujita, Takagi, Katsuo Kamoshita