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:
May. 10, 2005
Filed:
Aug. 09, 2001
Applicants:
Roland Blumenthal, Cham, CH;
Stephan Hundertmark, Lohmar, DE;
Inventors:
Roland Blumenthal, Cham, CH;
Stephan Hundertmark, Lohmar, DE;
Assignee:
Leybold Vakuum GmbH, Cologne, DE;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F01D001/36 ;
U.S. Cl.
CPC ...
Abstract
A friction vacuum pump () has at least one turbomolecular pump stage () with a molecular pump stage () that is subsequently connected on the pressure side (), and with a transition stage () mounted between the turbomolecular pump stage and the molecular pump stage. In order to improve the transition from the turbomolecular zone to the molecular zone, the transition stage has a flow section that is continuously tapered in the tangential by limiting surfaces ().