Granted Patent
Utility
US 4,397,987 · App. 06/422,063
Nitrile rubber/EPDM graft blends
Inventor:
Robert J. Cornell
Patented Case
View Patent ↗
Granted: Aug 9, 1983
Filed: Sep 23, 1982
Inventor
Robert J. Cornell
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.