Granted Patent
Utility
US 4,498,844 · App. 06/521,449
Liquid ring pump with conical or cylindrical port member
Inventors:
Douglas Eric Bissell, Charles M. Jozepaitis
Patented Case
View Patent ↗
Granted: Feb 12, 1985
Filed: Aug 8, 1983
Inventors
Douglas Eric Bissell
Charles M. Jozepaitis
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.