Granted Patent
Utility
US 4,850,808 · App. 06/713,488
Liquid ring pump having port member with internal passageways for handling carry-over gas
Inventors:
Walter J. Schultze, Ole B. Olsen
Patented Case
View Patent ↗
Granted: Jul 25, 1989
Filed: Mar 19, 1985
Inventors
Walter J. Schultze
Ole B. Olsen
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.