Granted Patent
Utility
US 6,190,149 · App. 09/294,647
Vacuum pump oil distribution system with integral oil pump
Inventor:
Jay L. Richman
Patented Case
View Patent ↗
Granted: Feb 20, 2001
Filed: Apr 19, 1999
Inventor
Jay L. Richman
Assignee (at issue)
Stokes Vacuum Inc.
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.