Granted Patent
Utility
US 5,053,501 · App. 07/497,541
Preparation of 3-exomethylenecepham sulfoxides and 2-chlorosulfinylazetidinones using molecular sieves
Inventors:
Jagdfish C. Kapur, Jan J. De Koning, Roland P. Bezemer
Patented Case
View Patent ↗
Granted: Oct 1, 1991
Filed: Mar 21, 1990
Inventors
Jagdfish C. Kapur
Jan J. De Koning
Roland P. Bezemer
Assignee (at issue)
Gist-Brocades N.V.
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.