Granted Patent
Utility
US 5,356,268 · App. 08/128,877
Check valve structures for liquid ring pumps
Inventors:
Louis J. Lengyel, Ramesh B. Shenoi
Patented Case
View Patent ↗
Granted: Oct 18, 1994
Filed: Sep 29, 1993
Inventors
Louis J. Lengyel
Ramesh B. Shenoi
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.