Granted Patent
Utility
US 4,501,877 · App. 06/558,391
Higher molecular weight polyesters from diacid anhydrides and cyclic alkylene carbonates
Inventor:
David R. Fagerburg
Patented Case
View Patent ↗
Granted: Feb 26, 1985
Filed: Dec 5, 1983
Inventor
David R. Fagerburg
Assignee (at issue)
EASTMAN KODAK 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.