Granted Patent
Utility
US 4,989,732 · App. 07/475,572
Pressure unitized pack of handled plastic film sacks
Inventor:
Graham Smith
Patented Case
View Patent ↗
Granted: Feb 5, 1991
Filed: Feb 6, 1990
Inventor
Graham Smith
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.