Granted Patent
Utility
US 4,276,464 · App. 05/958,574
Fume extracting device for a welding apparatus
Inventor:
Melvin L. Forney
Patented Case
View Patent ↗
Granted: Jun 30, 1981
Filed: Oct 23, 1978
Inventor
Melvin L. Forney
Assignee (at issue)
Caterpillar Tractor Co.
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.