Granted Patent
Utility
US 5,370,502 · App. 08/169,585
Liquid ring pumps with pressurized gas supported rotating liners
Inventors:
Harold K. Haavik, Kaj Holm
Patented Case
View Patent ↗
Granted: Dec 6, 1994
Filed: Dec 17, 1993
Inventors
Harold K. Haavik
Kaj Holm
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.