Granted Patent
Utility
US 5,245,711 · App. 07/394,072
Vacuum toilet system
Inventors:
Sven Oldfelt, Gary L. Stahl, Björn Still
Patented Case
View Patent ↗
Granted: Sep 21, 1993
Filed: Aug 15, 1989
Inventors
Sven Oldfelt
Gary L. Stahl
Björn Still
Assignee (at issue)
Oy Wartsila 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.