Granted Patent
Utility
US 4,877,606 · App. 07/145,116
Biodegradable amphipathic copolymers
Inventors:
Jeffrey R. Churchill, Francis G. Hutchinson
Patented Case
View Patent ↗
Granted: Oct 31, 1989
Filed: Jan 19, 1988
Inventors
Jeffrey R. Churchill
Francis G. Hutchinson
Assignee (at issue)
IMPERIAL CHEMICAL INDUSTRIES 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.