Granted Patent
Utility
US 4,862,732 · App. 07/109,928
Leak testing
Inventors:
Samuel O. Raymond, William H. Hulsman, Caleb Warner
Patented Case
View Patent ↗
Granted: Sep 5, 1989
Filed: Oct 19, 1987
Inventors
Samuel O. Raymond
William H. Hulsman
Caleb Warner
Assignee (at issue)
Benthos, 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.