Granted Patent
Utility
US 4,800,312 · App. 07/053,147
Mounting for brushes of electric motors
Inventors:
Rudolph W. Wacek, R. Lent Crevling, Jr.
Patented Case
View Patent ↗
Granted: Jan 24, 1989
Filed: May 21, 1987
Inventors
Rudolph W. Wacek
R. Lent Crevling, Jr.
Assignee (at issue)
SHOP VAC 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.