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:
Jul. 29, 2003
Filed:
Jan. 09, 2002
Günter Schütz, Köln, DE;
Christian Beyer, Köln, DE;
Ralf Adamietz, Wermelskirchen, DE;
Dieter Haas, Bruchköbel, DE;
Leybold Vakuum GmbH, Cologne, DE;
Abstract
A friction pump ( ), such as turbomolecular pump, includes a steel housing ( ) in which a steel shaft ( ) is supported by a bearing ( ). A rotor ( ) with a central bore ( ) is mounted on the shaft. In order to reduce the risk of the joint area between the rotor and the shaft becoming loose, a ring groove ( ) which encompasses the joint area between the rotor is provided in an area adjacent at least one of the faces of the rotor. A reinforcing ring ( ) of a high strength, low thermal expansion material encompasses one of a thrust member ( ) and cylindrical rotor sections ( ) adjacent the shaft.