Granted Patent
Utility
US 4,520,140 · App. 06/663,627
Polyoxyalkylene/unsaturated diester reaction product for cellular foam stabilization
Inventor:
Richard L. Frentzel
Patented Case
View Patent ↗
Granted: May 28, 1985
Filed: Oct 22, 1984
Inventor
Richard L. Frentzel
Assignee (at issue)
Celotex 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.