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. 05, 2022
Filed:
Aug. 08, 2017
Applicant:
Leybold Gmbh, Cologne, DE;
Inventors:
Thomas Dreifert, Kerpen, DE;
Dirk Schiller, Hürth, DE;
Wolfgang Giebmanns, Erftstadt, DE;
Roland Müller, Cologne, DE;
Assignee:
LEYBOLD GMBH, Cologne, DE;
Primary Examiner:
Int. Cl.
CPC ...
F01C 1/16 (2006.01); F03C 2/00 (2006.01); F03C 4/00 (2006.01); F04C 2/00 (2006.01); F04C 18/00 (2006.01); F04C 18/18 (2006.01); F04C 18/16 (2006.01); F04C 23/00 (2006.01);
U.S. Cl.
CPC ...
F04C 18/18 (2013.01); F04C 18/16 (2013.01); F04C 23/001 (2013.01); F04C 2230/10 (2013.01); F04C 2240/20 (2013.01); F04C 2250/20 (2013.01); F05C 2201/021 (2013.01); F05C 2201/903 (2013.01);
Abstract
A vacuum pump screw rotor, comprising at least two helical displacer elements on a rotor shaft. The at least two displacer elements have different pitches, but the pitches of each displacer element are constant. Furthermore, the displacer elements each have a helical recess, each having a contour that remains the same over its entire length. Hereby, a suction-side displacer element has a recess having an asymmetric contour, and a pressure-side displacer element has a recess having a symmetrical contour.