Granted Patent
Utility
US 6,453,481 · App. 09/813,196
Vacuum waste system having a vacuum control valve
Inventors:
Mark A. Pondelick, Frederick Larry Obee
Patented Case
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Granted: Sep 24, 2002
Filed: Mar 20, 2001
Inventors
Mark A. Pondelick
Frederick Larry Obee
Assignee (at issue)
Evac International Oy
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.