Granted Patent
Utility
US 5,213,479 · App. 07/865,448
Liquid ring pumps with improved housing shapes
Inventors:
Thomas R. Dardis, Douglas Eric Bissell, Richard Gordon
Patented Case
View Patent ↗
Granted: May 25, 1993
Filed: Apr 9, 1992
Inventors
Thomas R. Dardis
Douglas Eric Bissell
Richard Gordon
Assignee (at issue)
The Nash Engineering Company
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.