Granted Patent
Utility
US 6,082,979 · App. 08/880,542
Air pump for vacuum toilet systems
Inventor:
William J. Friedman
Patented Case
View Patent ↗
Granted: Jul 4, 2000
Filed: Jun 23, 1997
Inventor
William J. Friedman
Assignee (at issue)
BellandTechnology AG
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.