Granted Patent
Utility
US 4,680,039 · App. 06/864,420
Self-contained dust collector with quick release adapter duct
Inventor:
Alan E. Revell
Patented Case
View Patent ↗
Granted: Jul 14, 1987
Filed: May 19, 1986
Inventor
Alan E. Revell
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.