Granted Patent
Utility
US 6,244,841 · App. 09/065,505
Vacuum pumps
Inventors:
Nigel Paul Schofield, Michael Morris, Peter Birch
Patented Case
View Patent ↗
Granted: Jun 12, 2001
Filed: Apr 24, 1998
Inventors
Nigel Paul Schofield
Michael Morris
Peter Birch
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.