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:
Mar. 08, 2005
Filed:
Jul. 06, 2001
Hartmut Kriehn, Köln, DE;
Lothar Brenner, Bad Münstereifel, DE;
Manfred Behling, Köln, DE;
Thomas Dreifert, Kerpen, DE;
Klaus Rofall, Rösrath, DE;
Heinrich Englander, Linnich, DE;
Michael Froitzheim, Dormagen, DE;
Hartmut Kriehn, Köln, DE;
Lothar Brenner, Bad Münstereifel, DE;
Manfred Behling, Köln, DE;
Thomas Dreifert, Kerpen, DE;
Klaus Rofall, Rösrath, DE;
Heinrich Englander, Linnich, DE;
Michael Froitzheim, Dormagen, DE;
Leybold Vakuum GmbH, Cologne, DE;
Abstract
A vacuum pump has two shafts () and two rotors () which co-operate with each other and which are fixed to the shafts. The rotors are cantilevered on the shafts. The rotors are fixed to the shafts in a manner which is devoid of backlash, even during temperature changes. In order to achieve this, the shafts () are made of a material having a modulus of elasticity which is as high as possible, e.g., steel. The rotors () are made of a material having a density which is as low as possible, e.g., aluminum or a titanium alloy. Structures (; etc.) are provided to ensure that the rotors () are fixed to the shafts () in a manner which is devoid of backlash at all operating temperatures.