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:
Dec. 27, 2011
Filed:
Jun. 27, 2005
Damien Cirette, Octeville sur Mer, FR;
Damien Cirette, Octeville sur Mer, FR;
Sidel Participations, Octeville-sur-Mer, FR;
Abstract
The invention relates to a vacuum pumping circuit comprising: an upper chamber () and a lower chamber () that communicate via a connecting orifice (), and comprising a valve () provided with a stem guided so as to slide along a vertical axis (A) in order to close the connecting orifice (), which circuit is characterized in that the valve stem () is provided with a section forming a piston () which constitutes the mobile upper wall of a control chamber () communicating with the upper chamber (), the piston () having an upper face () at atmospheric air pressure and a lower face () on which the pressure is that present in the control chamber ().