Granted Patent
Utility
US 4,297,560 · App. 06/014,802
Process and apparatus for testing arc stud welding guns
Inventor:
Hermann Netzsch
Patented Case
View Patent ↗
Granted: Oct 27, 1981
Filed: Feb 26, 1979
Inventor
Hermann Netzsch
Assignee (at issue)
USM Holding AG
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.