Granted Patent
Utility
US 4,338,428 · App. 06/292,872
Novel polyamides from ketene-aminals
Inventors:
Louis M. Alberino, Dale F. Regelman
Patented Case
View Patent ↗
Granted: Jul 6, 1982
Filed: Aug 14, 1981
Inventors
Louis M. Alberino
Dale F. Regelman
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.