Granted Patent
Utility
US 5,366,348 · App. 08/126,908
Method and apparatus for selectively varying the flow rate of service liquid through a two stage liquid ring vacuum pump
Inventor:
Kevin J. Skelton
Patented Case
View Patent ↗
Granted: Nov 22, 1994
Filed: Sep 24, 1993
Inventor
Kevin J. Skelton
Assignee (at issue)
Graham Manufacturing Co., Inc.
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.