Granted Patent
Utility
US 4,636,528 · App. 06/865,877
Foaming of unsaturated polyester resin at elevated temperatures
Inventors:
Ernest R. Kamens, John Paul Cassoni
Patented Case
View Patent ↗
Granted: Jan 13, 1987
Filed: May 21, 1986
Inventors
Ernest R. Kamens
John Paul Cassoni
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.