Granted Patent
Utility
US 5,219,470 · App. 07/758,912
Apparatus and method for clarifier sludge collection
Inventors:
Bruce D. Bradley, Steven G. Coombs
Patented Case
View Patent ↗
Granted: Jun 15, 1993
Filed: Sep 10, 1991
Inventors
Bruce D. Bradley
Steven G. Coombs
Assignee (at issue)
Baker Hughes Holdings LLC
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.