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:
Aug. 15, 2023
Filed:
May. 15, 2020
Applicant:
Pfeiffer Vacuum, Annecy, FR;
Inventors:
Paul Decorde, Annecy, FR;
Yannick Grenier, Doussard, FR;
Assignee:
PFEIFFER VACUUM, Annecy, FR;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F04C 23/00 (2006.01); F04C 18/16 (2006.01); F04C 25/02 (2006.01);
U.S. Cl.
CPC ...
F04C 23/001 (2013.01); F04C 18/16 (2013.01); F04C 25/02 (2013.01);
Abstract
A dry-type primary vacuum pump includes an injection device to distribute a purging gas in the pumping stages. The injection device includes: a first pressure sensor arranged on a common portion of the distributor, a second pressure sensor arranged on each branch of the distributor, and a control unit to generate a pulse width modulation command signal for the control of the regulation valves independently of one another as a function of the pressure measurement differences between the first pressure sensor and the second pressure sensors.