Granted Patent
Utility
US 4,658,112 · App. 06/821,158
Welding control by power integration
Inventor:
Floyd M. Thompson
Patented Case
View Patent ↗
Granted: Apr 14, 1987
Filed: Jan 21, 1986
Inventor
Floyd M. Thompson
Assignee (at issue)
CRC-EVANS PIPELINE INTERNATIONAL, 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.