Granted Patent
Utility
US 5,273,797 · App. 07/464,812
Food package, retort lidding, and coextruded film therefor
Inventors:
Donald R. Hazelton, Lawrence K. Locke
Patented Case
View Patent ↗
Granted: Dec 28, 1993
Filed: Jan 16, 1990
Inventors
Donald R. Hazelton
Lawrence K. Locke
Assignee (at issue)
Exxon Chemical Patents, 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.