Granted Patent
Utility
US 4,284,870 · App. 05/907,393
Stud welding with fluid shield
Inventor:
Donald H. Ettinger
Patented Case
View Patent ↗
Granted: Aug 18, 1981
Filed: May 18, 1978
Inventor
Donald H. Ettinger
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.