Granted Patent
Utility
US 5,214,807 · App. 07/688,738
Vacuum toilet system
Inventor:
Rolf Terve
Patented Case
View Patent ↗
Granted: Jun 1, 1993
Filed: Apr 18, 1991
Inventor
Rolf Terve
Assignee (at issue)
Evac AB
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.