Granted Patent
Utility
US 4,892,911 · App. 07/144,652
Films using blends of polypropylene and polyisobutylene
Inventor:
Roger P. Genske
Patented Case
View Patent ↗
Granted: Jan 9, 1990
Filed: Jan 11, 1988
Inventor
Roger P. Genske
Assignee (at issue)
American National Can Company
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.