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. 08, 2003
Filed:
Apr. 10, 2000
Applicant:
Inventors:
Rudolf Bahnen, Roetgen, DE;
Thomas Dreifert, Köln, DE;
Assignee:
Leybold Vakuum GmbH, Cologne, DE;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F03C 2/00 ;
U.S. Cl.
CPC ...
F03C 2/00 ;
Abstract
A cooled screw vacuum pump has a housing ( ) two rotating systems ( ) consisting each of a screw rotor ( ) and a shaft ( ), a floating device supporting the rotors having, on each shaft, two mutually spaced bearings ( ) and an empty space ( ) arranged in each rotor ( ) open on the bearing side, wherein is respectively located an element cooling the rotor internally. In order to improve cooling it is suggested that the bearing ( ) of the support located on the rotor side, is placed outside the rotor ( ) empty space ( ), such that in said empty space ( ) there is more room available for obtaining efficient cooling.