Granted Patent
Utility
US 6,379,135 · App. 09/791,527
Vacuum pumps
Inventor:
Nigel Paul Schofield
Patented Case
View Patent ↗
Granted: Apr 30, 2002
Filed: Feb 22, 2001
Inventor
Nigel Paul Schofield
Assignee (at issue)
The BOC Group plc
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.