Granted Patent
Utility
US 6,804,840 · App. 10/171,857
Positive pressure waste transfer system
Inventor:
Claude L. Berman
Patented Case
View Patent ↗
Granted: Oct 19, 2004
Filed: Jun 14, 2002
Inventor
Claude L. Berman
Assignee (at issue)
Thetford BV
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.