Patents by Inventor Zhen J. Sheng

Zhen J. Sheng 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).

  • 3-(7'-oxo-1'-aza-4'-oxabicyclo[3.2.0]-hept-3'-YL)propionic acid derivative as antitumor agent
    Patent number: 5585373
    Abstract: A derivative of 3-(7'-oxo-1'-aza-4'-oxabicyclo[3.2.0 ]hept-3'-yl)propionic acid represented by the formula ##STR1## wherein R.sub.1 is a hydrogen atom, a lower alkyl group optionally having one or more cycloalkyl groups, a lower acyl group, a benzoyl group optionally having one or more substituents or a benzyl group optionally having one or more substituents, R.sub.2 is a hydrogen atom or a carboxyl-protecting group, R.sub.3 is a hydroxyl group, an azido group, a benzenesulfonyloxy group optionally having one or more substituents, a lower alkylsulfonyloxy group optionally having one or more substituents, a tri-substituted silyloxy group or an amino group optionally having one or more substituents, provided that when R.sub.1 and R.sub.2 are hydrogen atoms, R.sub.3 is not an amino group, and a salt thereof.
    Type: Grant
    Filed: November 18, 1994
    Date of Patent: December 17, 1996
    Assignee: Taiho Pharmaceutical Co., Ltd
    Inventors: Zhang Z. Ping, Zhen J. Sheng, Zhang Q. Rong, Zhang J. Liang, Singh Rajeshwar, Tomohiro Yamashita, Toshiyuki Toko, Hiroshi Matsumoto