Patents by Inventor Kenya Kawashima

Kenya Kawashima 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).

  • 1 ,1-Dichloro-1a,1b-dihydrodibenzo(b,f)cycloprop(d)azepine-6(1H)-carboxalde hyde
    Patent number: 3992370
    Abstract: 1,1-Dichloro-1a, 10b-dihydrodibenzo(b,f)cycloprop(d)azepine-6(1H)-carboxaldehyde is produced in good yield through a reaction between a compound of the general formula ##SPC1##Wherein R stands for hydrogen or formyl group and chloroform. Thus obtained product can be used as a valuable intermediate for synthesizing medicines and is further convertible to known drugs, e.g. 6-(3-dimethylamino)propyl)-1, 1a, 6, 10b-tetrahydrodibenzo(b,f)cycloprop(d)azepine.
    Type: Grant
    Filed: January 23, 1974
    Date of Patent: November 16, 1976
    Assignee: Takeda Chemical Industries, Ltd.
    Inventors: Kenya Kawashima, Takahiro Saraie, Yasuhiko Kawano, Toshihiro Ishiguro