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:
Apr. 14, 2015
Filed:
Apr. 16, 2008
Applicants:
Neil Turner, Godalming, GB;
Malcolm William Gray, Crawley, GB;
Jack Raymond Tattersall, Lancing, GB;
Inventors:
Neil Turner, Godalming, GB;
Malcolm William Gray, Crawley, GB;
Jack Raymond Tattersall, Lancing, GB;
Assignee:
Edwards Limited, Crawley, West Sussex, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F04C 18/12 (2006.01); F04C 18/08 (2006.01); F04C 25/02 (2006.01);
U.S. Cl.
CPC ...
F04C 18/123 (2013.01); F04C 18/126 (2013.01); Y10S 417/01 (2013.01); F04C 18/084 (2013.01); F04C 25/02 (2013.01); F04C 2220/10 (2013.01); F04C 2280/02 (2013.01);
Abstract
A pair of Northey rotors for a vacuum pump, in which each rotor comprises two opposing, substantially parallel faces, and a peripheral surface located between the opposing faces. In order to reduce damage caused by pumping a gas stream containing liquid or solid particulates, a plurality of grooves is located on the peripheral surface for accommodating the particulates.