Granted Patent
Utility
US 4,481,335 · App. 06/291,386
Rubber compositions and method
Inventor:
Fred J. Stark, Jr.
Patented Case
View Patent ↗
Granted: Nov 6, 1984
Filed: Aug 10, 1981
Inventor
Fred J. Stark, Jr.
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.