Granted Patent
Utility
US 4,977,193 · App. 07/519,002
Stabilization and foaming of polyvinylchloride resins
Inventors:
Michael R. Croce, Stuart D. Brilliant
Patented Case
View Patent ↗
Granted: Dec 11, 1990
Filed: May 4, 1990
Inventors
Michael R. Croce
Stuart D. Brilliant
Assignee (at issue)
Witco 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.