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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.:

US 11293435 B1

PDFFull Text
Date of Patent:
Apr. 05, 2022

Filed:

Aug. 08, 2017

Vacuum pump screw rotors with symmetrical profiles on low pitch sections

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;

Attorney:

Ohlandt, Greeley, Ruggiero and Perle, LLP

Primary Examiner:

Theresa Trieu

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.

Find Patent Forward Citations

Dreifert, Thomas. (2022). Vacuum pump screw rotors with symmetrical profiles on low pitch sections (U.S. Patent No. 11293435). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/11293435

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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