Granted Patent
Utility
US 4,376,491 · App. 06/314,571
Flexible membrane container closure
Inventor:
Harold J. Banker
Patented Case
View Patent ↗
Granted: Mar 15, 1983
Filed: Oct 26, 1981
Inventor
Harold J. Banker
Assignee (at issue)
NER Data Products, Inc.
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.