Granted Patent
Utility
US 4,810,849 · App. 07/037,864
Weld gun control
Inventor:
Robert J. Heideman
Patented Case
View Patent ↗
Granted: Mar 7, 1989
Filed: Apr 13, 1987
Inventor
Robert J. Heideman
Assignee (at issue)
Enertrols, 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.