Granted Patent
Utility
US 4,769,397 · App. 06/908,625
Chemical blowing agent compositions
Inventors:
Robert M. Lapierre, Nicholas J. Leonardi
Patented Case
View Patent ↗
Granted: Sep 6, 1988
Filed: Sep 18, 1986
Inventors
Robert M. Lapierre
Nicholas J. Leonardi
Assignee (at issue)
Enron Chemical Company
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.