Granted Patent
Utility
US 5,266,640 · App. 07/657,150
Weather and heat resistant blended nitrile polymers
Inventors:
Rudolph Karg, Connie L. Hill
Patented Case
View Patent ↗
Granted: Nov 30, 1993
Filed: Feb 14, 1991
Inventors
Rudolph Karg
Connie L. Hill
Assignee (at issue)
DSM Copolymer, Inc.
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.