Granted Patent
Utility
US 5,152,613 · App. 07/674,647
Plastic film zipper bag having straightened heat seals
Inventor:
F. John Herrington
Patented Case
View Patent ↗
Granted: Oct 6, 1992
Filed: Mar 22, 1991
Inventor
F. John Herrington
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.