Patents by Inventor Tadashi Kometani

Tadashi Kometani 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 preparing optically active benzothiazepine compound and intermediate therefor
    Patent number: 5945533
    Abstract: Powdery aggregate of 2-phenyl-1,5-benzothiazepin-3,4(2H,5H)-dione compound: ##STR1## wherein Ring A and Ring B are benzene ring having optionally substituent selected from lower alkyl, lower alkoxy and halogen, which is prepared by admixing solution of the compound (II) in polar organic solvent with solvent which does not substantially dissolve the compound (II) but is miscible with said polar organic solvent, and separating and collecting the resultant particles of the compound (II). Said aggregate of the compound (II) can be converted into optically active 3-hydroxy-2-phenyl-2,3-dihydro-1,5-benzothiazepin-4(5H)-one compounds (I) on industrial scale, which are useful as intermediate for various medicaments.
    Type: Grant
    Filed: August 14, 1997
    Date of Patent: August 31, 1999
    Assignee: Tanabe Seiyaku Co., Ltd.
    Inventors: Tadashi Kometani, Hiroaki Matsumae, Takeji Shibatani