Granted Patent
Utility
US 4,289,950 · App. 06/039,216
Narrow gap welding apparatus
Inventor:
Elmer L. Griebeler
Patented Case
View Patent ↗
Granted: Sep 15, 1981
Filed: May 15, 1979
Inventor
Elmer L. Griebeler
Assignee (at issue)
C-R-O, 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.