Granted Patent
Utility
US 4,506,749 · App. 06/335,595
Underhood muffler for tractor
Inventor:
Gerald E. Sieren
Patented Case
View Patent ↗
Granted: Mar 26, 1985
Filed: Dec 30, 1981
Inventor
Gerald E. Sieren
Assignee (at issue)
Allis-Chalmers Corporation
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.