Granted Patent
Utility
US 4,720,872 · App. 06/940,231
Thermoplastic bag and method of forming the same
Inventor:
David J. Kaczerwaski
Patented Case
View Patent ↗
Granted: Jan 19, 1988
Filed: Dec 11, 1986
Inventor
David J. Kaczerwaski
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.