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:
Feb. 12, 2019
Filed:
Dec. 18, 2013
Applicant:
Xerex Ab, Taby, SE;
Inventor:
Peter Tell, Akersberga, SE;
Assignee:
Xerex AB, Täby, SE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F04F 5/22 (2006.01); F04F 5/46 (2006.01); F04F 5/54 (2006.01);
U.S. Cl.
CPC ...
F04F 5/22 (2013.01); F04F 5/466 (2013.01); F04F 5/54 (2013.01);
Abstract
An ejector system includes a primary ejector in a drive stage and a booster ejector connected in parallel with the primary ejector for simultaneously generating a vacuum across a booster stage. The booster ejector may be configured to generate a vacuum to a lower pressure in the booster stage than in the primary ejector in the drive stage. The booster stage and the drive stage may be connected to a common volume to be evacuated and a valve may be provided to close the connection between the drive stage and the volume to be evacuated when the pressure in the volume to be evacuated falls below the minimum pressure that can be generated in the drive stage.