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. 20, 2018
Filed:
Dec. 14, 2015
Applicant:
Edwards Limited, Crawley, West Sussex, GB;
Inventors:
Nigel Paul Schofield, Horsham, GB;
Stephen Dowdeswell, Cuckfield, GB;
Assignee:
Edwards Limited, Crawley, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F03C 2/00 (2006.01); F03C 4/00 (2006.01); F04C 2/00 (2006.01); F04C 15/00 (2006.01); F04C 18/12 (2006.01); F01C 1/12 (2006.01); F04C 2/12 (2006.01); F01C 1/08 (2006.01); F01C 21/08 (2006.01); F04C 25/02 (2006.01); F04C 2/08 (2006.01); F04C 29/00 (2006.01); F04C 18/08 (2006.01);
U.S. Cl.
CPC ...
F04C 18/126 (2013.01); F01C 1/084 (2013.01); F01C 1/126 (2013.01); F01C 21/08 (2013.01); F04C 2/084 (2013.01); F04C 2/126 (2013.01); F04C 25/02 (2013.01); F04C 18/084 (2013.01); F04C 29/0078 (2013.01); F04C 2230/00 (2013.01); F04C 2240/20 (2013.01); Y10T 29/49236 (2015.01);
Abstract
The present invention relates to a rotor for a vacuum pumphaving a roots pumping mechanism, the rotor comprising at least two hollow lobes, each lobe having an outer wallwhich defines a lobe profile, a hollow cavitygenerally inward of the outer wall, and at least one strengthening riblocated in the cavity to resist stress on the lobes generated during rotation.