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:
Sep. 07, 2010
Filed:
Jul. 20, 2006
Jean-luc Rival, Villaz, FR;
Jean-Luc Rival, Villaz, FR;
Alcatel, Paris, FR;
Abstract
A method and apparatus for reducing the pressure in an enclosure are provided. The method includes at least one primary pump on the outlet side and one secondary pump on the inlet side connected in series in the flow path of the pumped gases and driven in the same rotation direction by a first electric motor and a second electric motor, respectively, controlled by an electronic control module for modifying the speeds of the two electric motors independently, and includes at least one step, during reducing the pressure in the enclosure, of progressively increasing the rotation speed of the secondary pump in accordance with a rotation speed variation law of the secondary pump and at the same time progressively reducing the rotation speed of the primary pump in accordance with a rotation speed variation law of the primary pump.