Granted Patent
Utility
US 5,848,873 · App. 08/848,368
Vacuum pumps
Inventor:
Nigel Paul Schofield
Patented Case
View Patent ↗
Granted: Dec 15, 1998
Filed: Apr 30, 1997
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.