Granted Patent
Utility
US 4,942,283 · App. 07/419,304
Stud welding apparatus
Inventor:
Bruno Mergell
Patented Case
View Patent ↗
Granted: Jul 17, 1990
Filed: Oct 10, 1989
Inventor
Bruno Mergell
Assignee (at issue)
Emhart Industries, 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.