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:
Nov. 24, 1992
Filed:
Jul. 19, 1990
Frank Fleischmann, Bergheim-Glessen, DE;
Hans-Peter Kabelitz, Koln, DE;
Hans Kriechel, Bornheim, DE;
Martin Muhlhoff, Koln, DE;
Leybold Aktiengesellschaft, Koln, DE;
Abstract
A friction pump includes a generally cylindrical first housing part, a generally cylindrical second housing part projecting axially into the inner space of the first housing part; a bearing mounted in the second housing part coaxially therewith; and a pump rotor supported for rotation in the bearing. The pump rotor has a cylindrical shell surrounding the second housing part. The pump further has a drive motor mounted in the second housing part for driving the pump rotor; and a helical channel defined between the inner face of the first housing part and the outer face of the pump rotor for pumping gases upon rotation of the pump rotor. The second housing part, the bearing, the pump rotor and the drive motor form a single structural unit that can be axially removed from the first housing part after releasing a coupler between the two housing parts.