Granted Patent
Utility
US 4,533,598 · App. 06/553,196
Extended polyurethanes
Inventors:
William J. Downey, Melvin Brauer
Patented Case
View Patent ↗
Granted: Aug 6, 1985
Filed: Nov 18, 1983
Inventors
William J. Downey
Melvin Brauer
Assignee (at issue)
CasChem, Inc.
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.