The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 12, 2013
Filed:
Sep. 23, 2004
Applicants:
Ian David Stones, Burgess Hill, GB;
David John Goodwin, Southgate, GB;
Inventors:
Ian David Stones, Burgess Hill, GB;
David John Goodwin, Southgate, GB;
Assignee:
Edwards Limited, Crawley, West Sussex, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F01D 3/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
A vacuum pump comprises a first pumping section (), and, downstream therefrom, a second pumping section (), The pump comprises a first pump inlet () through which fluid can enter the pump and pass through both the first and second pumping sections towards a pump outlet, and a second pump inlet () through which fluid can enter the pump and pass through only the second pumping section towards the outlet. The second pumping section () comprises an externally threaded rotor ().