Granted Patent
Utility
US 4,482,170 · App. 06/279,617
Gas riser apparatus
Inventors:
Irvin D. Jacobson, Frank R. Volgstadt, Carl E. Passerell
Patented Case
View Patent ↗
Granted: Nov 13, 1984
Filed: Jul 1, 1981
Inventors
Irvin D. Jacobson
Frank R. Volgstadt
Carl E. Passerell
Assignee (at issue)
Perfection Holdings LLC
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.