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:
Oct. 25, 2016
Filed:
Aug. 07, 2012
Applicants:
Peter Birch, Sussex, DE;
Thomas Dreifert, Kerpen, DE;
Robert Jenkins, Sussex, DE;
Clive Tunna, Sussex, DE;
Inventors:
Peter Birch, Sussex, DE;
Thomas Dreifert, Kerpen, DE;
Robert Jenkins, Sussex, DE;
Clive Tunna, Sussex, DE;
Assignee:
OERLIKON LEYBOLD VACCUM GMBH, Cologne, DE;
Primary Examiner:
Int. Cl.
CPC ...
F03C 2/00 (2006.01); F03C 4/00 (2006.01); F04C 2/00 (2006.01); F04C 18/12 (2006.01); F04C 23/00 (2006.01); F04C 25/02 (2006.01); F04C 18/08 (2006.01);
U.S. Cl.
CPC ...
F04C 18/126 (2013.01); F04C 18/086 (2013.01); F04C 23/001 (2013.01); F04C 23/003 (2013.01); F04C 25/02 (2013.01);
Abstract
A Roots pump comprises a plurality of multi-toothed rotary pumps, each forming a pump stage, and connection channels connecting respective adjacent pump stages. The invention provides that the connection channels are arranged in partitioning walls separating the adjacent pump stages.