Granted Patent
Utility
US 4,208,321 · App. 06/033,933
Polyamide resins flame retarded by poly(metal phosphinate)s
Inventor:
Stanley R. Sandler
Patented Case
View Patent ↗
Granted: Jun 17, 1980
Filed: Apr 27, 1979
Inventor
Stanley R. Sandler
Assignee (at issue)
Pennwalt 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.