Granted Patent
Utility
US 3,969,176 · App. 05/425,860
Method for heat sealing polyester film
Inventors:
Howard D. Bassett, Franklin E. Schrage, George F. Kirkpatrick
Patented Case
View Patent ↗
Granted: Jul 13, 1976
Filed: Dec 18, 1973
Inventors
Howard D. Bassett
Franklin E. Schrage
George F. Kirkpatrick
Assignee (at issue)
Union Carbide 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.