Granted Patent
Utility
US 5,081,338 · App. 07/655,827
Apparatus and method for monitoring weld quality
Inventor:
Gerald Dufrenne
Patented Case
View Patent ↗
Granted: Jan 14, 1992
Filed: Feb 15, 1991
Inventor
Gerald Dufrenne
Assignee (at issue)
Unitek Equipment 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.