Granted Patent
Utility
US 4,901,558 · App. 07/288,676
Seal integrity tester and method
Inventors:
Lyndon R. Leining, Eric Vandenberg, Ralph O. Erlandson
Patented Case
View Patent ↗
Granted: Feb 20, 1990
Filed: Dec 22, 1988
Inventors
Lyndon R. Leining
Eric Vandenberg
Ralph O. Erlandson
Assignee (at issue)
Geo. A. Hormel & Co.
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.