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:
Sep. 09, 2014
Filed:
Dec. 04, 2006
Applicants:
Michael Henry North, Redhill, GB;
Neil Turner, Godalming, GB;
Tristan Richard Ghislain Davenne, Shoreham-by-Sea, GB;
Timothy Charles Draper, East Grinstead, GB;
Inventors:
Michael Henry North, Redhill, GB;
Neil Turner, Godalming, GB;
Tristan Richard Ghislain Davenne, Shoreham-by-Sea, GB;
Timothy Charles Draper, East Grinstead, GB;
Assignee:
Edwards Limited, Crawley, West Sussex, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F03C 2/00 (2006.01); F03C 4/00 (2006.01); F04C 18/00 (2006.01); F04C 18/16 (2006.01); F04C 18/08 (2006.01);
U.S. Cl.
CPC ...
F04C 18/16 (2013.01); F04C 18/084 (2013.01); F04C 2250/201 (2013.01);
Abstract
A screw pump includes a stator having a fluid inlet and a fluid outlet, the stator housing first and second externally threaded, tapered rotors mounted on respective shafts and adapted for counter-rotation within the stator to compress fluid passing from the fluid inlet to the fluid outlet, wherein the threads have a pitch that increases towards the fluid outlet.