Granted Patent
Utility
US 3,948,436 · App. 05/520,955
Multilayer bag
Inventor:
John D. Bambara
Patented Case
View Patent ↗
Granted: Apr 6, 1976
Filed: Nov 4, 1974
Inventor
John D. Bambara
Assignee (at issue)
Packaging Industries Group, 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.