Granted Patent
Utility
US 4,774,313 · App. 07/122,718
Polyurethanes having improved crack growth resistance
Inventor:
Joseph H. Tazewell
Patented Case
View Patent ↗
Granted: Sep 27, 1988
Filed: Nov 18, 1987
Inventor
Joseph H. Tazewell
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.