Granted Patent
Utility
US 6,109,864 · App. 09/151,630
Vacuum pumps
Inventors:
Nigel Paul Schofield, Ian David Stones
Patented Case
View Patent ↗
Granted: Aug 29, 2000
Filed: Sep 11, 1998
Inventors
Nigel Paul Schofield
Ian David Stones
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.