Granted Patent
Utility
US 4,220,579 · App. 05/897,066
Thermoplastic elastomeric blend of monoolefin copolymer rubber, amorphous polypropylene resin and crystalline polyolefin resin
Inventor:
Robert E. Rinehart
Patented Case
View Patent ↗
Granted: Sep 2, 1980
Filed: Apr 17, 1978
Inventor
Robert E. Rinehart
Assignee (at issue)
Uniroyal Ltd.
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.