Granted Patent
Utility
US 5,213,469 · App. 07/819,027
Sewage pump with improved inlet construction
Inventors:
Brian M. Mitsch, Ralph D. Austen, Robert S. Jones
Patented Case
View Patent ↗
Granted: May 25, 1993
Filed: Jan 10, 1992
Inventors
Brian M. Mitsch
Ralph D. Austen
Robert S. Jones
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.