Granted Patent
Utility
US 4,934,180 · App. 07/252,737
Testing container seals
Inventor:
William H. Hulsman
Patented Case
View Patent ↗
Granted: Jun 19, 1990
Filed: Oct 3, 1988
Inventor
William H. Hulsman
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.