Granted Patent
Utility
US 5,310,897 · App. 07/974,302
Beta-lactams and their production
Inventors:
Makoto Sunagawa, Akira Sasaki, Koshiro Goda
Patented Case
View Patent ↗
Granted: May 10, 1994
Filed: Nov 10, 1992
Inventors
Makoto Sunagawa
Akira Sasaki
Koshiro Goda
Assignee (at issue)
Sumitomo Pharmaceuticals Company Limited
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.