Granted Patent
Utility
US 3,974,356 · App. 05/500,688
Multiple arc welding device and method
Inventors:
Jerome W. Nelson, James B. Randolph
Patented Case
View Patent ↗
Granted: Aug 10, 1976
Filed: Aug 26, 1974
Inventors
Jerome W. Nelson
James B. Randolph
Assignee (at issue)
CRC-Crose 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.