Granted Patent
Utility
US 4,489,156 · App. 06/256,761
Chloramphenicol derivatives
Inventors:
Pyare Khanna, Evan S. Snyder, Prithipal Singh
Patented Case
View Patent ↗
Granted: Dec 18, 1984
Filed: Apr 23, 1981
Inventors
Pyare Khanna
Evan S. Snyder
Prithipal Singh
Assignee (at issue)
Syva Company
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.