Granted Patent
Utility
US 4,973,171 · App. 07/375,554
Closable plastic bag
Inventor:
Edward M. Bullard
Patented Case
View Patent ↗
Granted: Nov 27, 1990
Filed: Jul 5, 1989
Inventor
Edward M. Bullard
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.