Granted Patent
Utility
US 4,264,490 · App. 06/038,062
Composition of a polyethylene and isobutylene copolymer
Inventor:
Anthony J. Berejka
Patented Case
View Patent ↗
Granted: Apr 28, 1981
Filed: May 11, 1979
Inventor
Anthony J. Berejka
Assignee (at issue)
Radiation Dynamics, 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.