Granted Patent
Utility
US 4,460,714 · App. 06/557,076
Unsaturated polyester resin foams using inorganic iron salts
Inventor:
Ernest R. Kamens
Patented Case
View Patent ↗
Granted: Jul 17, 1984
Filed: Dec 1, 1983
Inventor
Ernest R. Kamens
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.