Granted Patent
Utility
US 6,558,131 · App. 09/896,628
Liquid ring pumps with automatic control of seal liquid injection
Inventor:
David Nash
Patented Case
View Patent ↗
Granted: May 6, 2003
Filed: Jun 29, 2001
Inventor
David Nash
Assignee (at issue)
nash
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.