Granted Patent
Utility
US 5,015,393 · App. 07/384,555
Automatically adjustable weir and environmentally protected sensor for a floating sludge removal system
Inventors:
Frederick E. Russell, Brandon Russell
Patented Case
View Patent ↗
Granted: May 14, 1991
Filed: Jul 24, 1989
Inventors
Frederick E. Russell
Brandon Russell
Assignee (at issue)
Protectaire Systems, Co.
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.