Granted Patent
Utility
US 5,255,559 · App. 07/860,740
Apparatus for testing the gas-tightness of a joint between hollow members
Inventor:
Manfred Jansch
Patented Case
View Patent ↗
Granted: Oct 26, 1993
Filed: Mar 25, 1992
Inventor
Manfred Jansch
Assignee (at issue)
Weatherford/Lamb, 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.