Granted Patent
Utility
US 4,635,839 · App. 06/581,504
Welding carriage
Inventor:
Clyde M. Slavens
Patented Case
View Patent ↗
Granted: Jan 13, 1987
Filed: Feb 17, 1984
Inventor
Clyde M. Slavens
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.