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. 01, 2003
Filed:
May. 14, 2001
Applicant:
Inventors:
Armin Conrad, Herborn, DE;
Peter Fahrenbach, Braunfels, DE;
Assignee:
Pfeiffer Vacuum GmbH, Asslar, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F04D 1/904 ;
U.S. Cl.
CPC ...
F04D 1/904 ;
Abstract
A gas friction pump including a plurality of pumping active rotor and stator components arranged in the pump housing for delivery of gases and for producing a compression ration and having a diameter larger than a diameter of the suction opening formed in the housing, and a modified rotor component located adjacent to the suction opening and having a radial extent which increases starting from the suction opening in a direction of a radial extent of the pumping active rotor and stator components.