Granted Patent
Utility
US 5,044,566 · App. 07/457,456
Sewage pump with self-adjusting cutters
Inventor:
Brian M. Mitsch
Patented Case
View Patent ↗
Granted: Sep 3, 1991
Filed: Dec 27, 1989
Inventor
Brian M. Mitsch
Assignee (at issue)
Federal Signal 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.