Granted Patent
Utility
US 6,397,407 · App. 10/003,318
Vacuum toilet system with single pump
Inventor:
Kjell Dahlberg
Patented Case
View Patent ↗
Granted: Jun 4, 2002
Filed: Dec 6, 2001
Inventor
Kjell Dahlberg
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.