Granted Patent
Utility
US 5,899,668 · App. 08/791,508
Two-stage liquid ring pumps having separate gas and liquid inlets to the second stage
Inventors:
Ramesh B. Shenoi, Carl G. Dudeck
Patented Case
View Patent ↗
Granted: May 4, 1999
Filed: Jan 30, 1997
Inventors
Ramesh B. Shenoi
Carl G. Dudeck
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.