Granted Patent
Utility
US 4,435,525 · App. 06/479,300
Reaction of carbonylhydrazines and organic peroxides to foam unsaturated polyester resins
Inventor:
Ernest R. Kamens
Patented Case
View Patent ↗
Granted: Mar 6, 1984
Filed: Mar 28, 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.