Granted Patent
Utility
US 4,420,602 · App. 06/424,418
Melt-polymerization process for the preparation of thermoplastic polyamides and polyesteramides
Inventors:
Henry W. Bonk, Robert G. Nelb, II, Richard W. Oertel, III
Patented Case
View Patent ↗
Granted: Dec 13, 1983
Filed: Sep 27, 1982
Inventors
Henry W. Bonk
Robert G. Nelb, II
Richard W. Oertel, III
Assignee (at issue)
The Upjohn Co.
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.