Granted Patent
Utility
US 4,283,617 · App. 06/021,784
Automatic pipe welding system
Inventors:
George J. Merrick, George E. Cook, Donald D. Modglin
Patented Case
View Patent ↗
Granted: Aug 11, 1981
Filed: Mar 19, 1979
Inventors
George J. Merrick
George E. Cook
Donald D. Modglin
Assignee (at issue)
Merrick Welding 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.