Granted Patent
Utility
US 6,045,336 · App. 09/069,051
Pump and valve for leachate extraction of heavier than water fluids
Inventors:
Richard T. Webb, Thomas H. Hitchcock
Patented Case
View Patent ↗
Granted: Apr 4, 2000
Filed: Apr 28, 1998
Inventors
Richard T. Webb
Thomas H. Hitchcock
Assignee (at issue)
Clean Environment Engineers, Inc.
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.