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:
Jan. 28, 2020
Filed:
Jul. 03, 2014
Applicant:
Pfeiffer Vacuum, Annecy, FR;
Inventors:
Thierry Neel, Meythet, FR;
Serge Brandolin, Annecy, FR;
Assignee:
PFEIFFER VACUUM, Annecy, FR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F04F 5/46 (2006.01); F04F 5/54 (2006.01); F04F 5/20 (2006.01); F04F 5/48 (2006.01);
U.S. Cl.
CPC ...
F04F 5/461 (2013.01); F04F 5/20 (2013.01); F04F 5/48 (2013.01); F04F 5/54 (2013.01);
Abstract
A dry roughing vacuum pump includes a valve () with a through-passage arranged in the discharge line (), the valve () with a through-passage being able to move between a closed position in which the valve () with a through-passage is in contact with a seat of a mouth () of the discharge line () and an open position in which the valve with a through-passage is moved away from the mouth () of the discharge line (), the vacuum pump including a motor gas injection device () that is configured to inject a motor gas into the inlet () of the Venturi-effect passage ().