Granted Patent
Utility
US 4,551,070 · App. 06/685,236
Noise control for conically ported liquid ring pumps
Inventors:
Ole B. Olsen, Charles W. Bilik, Herbert H. Johnson, Charles M. Jozepaitis
Patented Case
View Patent ↗
Granted: Nov 5, 1985
Filed: Dec 21, 1984
Inventors
Ole B. Olsen
Charles W. Bilik
Herbert H. Johnson
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.