Granted Patent
Utility
US 4,650,851 · App. 06/841,489
Purification of glycolide
Inventors:
David Rhum, Richard S. Matthews
Patented Case
View Patent ↗
Granted: Mar 17, 1987
Filed: Mar 19, 1986
Inventors
David Rhum
Richard S. Matthews
Assignee (at issue)
Pfizer Hospital Products Group, Inc.
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.