Granted Patent
Utility
US 4,474,939 · App. 06/565,302
Method of making selected polyesters
Inventor:
Edward J. Holzrichter
Patented Case
View Patent ↗
Granted: Oct 2, 1984
Filed: Dec 27, 1983
Inventor
Edward J. Holzrichter
Assignee (at issue)
Whittaker Corporation
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.