Granted Patent
Utility
US 4,408,643 · App. 06/232,139
Plastic bags having a pressure resistant closure
Inventors:
Louis L. Laske, Donald R. Harreld
Patented Case
View Patent ↗
Granted: Oct 11, 1983
Filed: Feb 6, 1981
Inventors
Louis L. Laske
Donald R. Harreld
Assignee (at issue)
VONCO PRODUCTS, LLC
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.