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:
May. 19, 1992
Filed:
Dec. 20, 1990
Applicant:
Inventors:
Hans-Peter Kabelitz, Cologne, DE;
Martin Muhlhoff, Cologne, DE;
Hans Kriechel, Bornheim, DE;
Wolfgang Maas, Cologne, DE;
Dieter-Martin Kolvenbach, Cologne, DE;
Assignee:
Leybold AG, Hanau, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F04B / ;
U.S. Cl.
CPC ...
41742313 ; 4174242 ; 4151212 ; 4151691 ; 184-623 ; 55269 ; 55466 ; 210168 ; 2104165 ;
Abstract
A housing 3 disposed below the rotor accommodates a driving motor 13, shaft bearings 14, 15 and an oil sump 21. An evacuating line 31 which traverses the wall the housing 3 connects a vacuum pump to the interior 18 of the housing. In order to avoid the loss of oil in the housing or the bearings, the evacuating line 31 and the oil sump 21 are directly connected.