Granted Patent
Utility
US 4,385,223 · App. 06/172,389
Circuit for use with arc voltage controllers in AC gas tungsten arc welding
Inventor:
James M. Thommes
Patented Case
View Patent ↗
Granted: May 24, 1983
Filed: Jul 25, 1980
Inventor
James M. Thommes
Assignee (at issue)
Cyclomatic 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.