Granted Patent
Utility
US 4,652,253 · App. 06/642,611
Method for preparing flat-bottom thermoplastic sack
Inventor:
Gordon L. Benoit
Patented Case
View Patent ↗
Granted: Mar 24, 1987
Filed: Aug 20, 1984
Inventor
Gordon L. Benoit
Assignee (at issue)
Mobil Oil Corporation
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.