Granted Patent
Utility
US 4,604,445 · App. 06/724,693
Polyurethane prepolymer comprising the reaction product of at least two active hydrogen containing substances with polyisocyanate
Inventors:
Edward L. Kay, Kenneth B. Roskos
Patented Case
View Patent ↗
Granted: Aug 5, 1986
Filed: Apr 18, 1985
Inventors
Edward L. Kay
Kenneth B. Roskos
Assignee (at issue)
The Firestone Tire & Rubber 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.