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:
Dec. 10, 2013
Filed:
Apr. 13, 2010
Peter Birch, Sussex, GB;
Robert Jenkins, Sussex, GB;
Roland Müller, Köln, DE;
Magnus Janicki, Köln, DE;
Wolfgang Giebmanns, Erftstadt, DE;
Peter Birch, Sussex, GB;
Robert Jenkins, Sussex, GB;
Roland Müller, Köln, DE;
Magnus Janicki, Köln, DE;
Wolfgang Giebmanns, Erftstadt, DE;
Oerlikon Leybold Vaccum GmbH, Cologne, DE;
Abstract
A screw vacuum pump, in particular for compression against atmospheric pressure, comprises a pump housing defining a suction chamber. Two meshing screw rotors are arranged in the suction chamber. Further, an overpressure outlet provided, which comprises an overpressure opening in a side wall of the suction chamber. Further, an overpressure valve is arranged in the overpressure outlet. The width (b) of the overpressure opening in the longitudinal direction of the screw rotors is smaller than or equal to a tooth width (B) of the screw rotors.