Granted Patent
Utility
US 4,421,900 · App. 06/369,283
Blends of natural and synthetic rubbers
Inventor:
Gary R. Hamed
Patented Case
View Patent ↗
Granted: Dec 20, 1983
Filed: Apr 16, 1982
Inventor
Gary R. Hamed
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.