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. 06, 2018
Filed:
Jul. 11, 2014
Applicant:
Pfeiffer Vacuum Gmbh, Asslar, DE;
Inventors:
Jan Hofmann, Gruenberg, DE;
Mirko Mekota, Ehringshausen, DE;
Assignee:
PFEIFFER VACUUM GMBH, Asslar, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F04D 19/04 (2006.01); F04D 29/056 (2006.01); F04D 29/64 (2006.01); F04D 29/10 (2006.01);
U.S. Cl.
CPC ...
F04D 29/056 (2013.01); F04D 19/04 (2013.01); F04D 19/042 (2013.01); F04D 29/102 (2013.01); F04D 29/646 (2013.01); Y10T 29/49245 (2015.01);
Abstract
A vacuum pump has a working space, a bearing space, a dividing wall arranged between the working space and the bearing space and at least one rotor shaft which extends through the dividing wall and which forms a gap with the dividing wall and having a blocking device for blocking between the working space and the bearing space. The blocking device is formed by a Siegbahn pump stage which is configured for providing a pump action passing through the gap between the working space and the bearing space.