Granted Patent
Utility
US 4,166,209 · App. 05/848,827
Apparatus for reducing operating noise of the air-carbon arc cutting and gouging process
Inventors:
Perry J. Rieppel, Raymond A. Sadauskas
Patented Case
View Patent ↗
Granted: Aug 28, 1979
Filed: Nov 7, 1977
Inventors
Perry J. Rieppel
Raymond A. Sadauskas
Assignee (at issue)
Arcair Company
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.