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. 31, 2013
Filed:
Aug. 06, 2009
Jisoo Kim, Pleasanton, CA (US);
Thorsten B. Lill, Santa Clara, CA (US);
Jisoo Kim, Pleasanton, CA (US);
Thorsten B. Lill, Santa Clara, CA (US);
Applied Materials, Inc., Santa Clara, CA (US);
Abstract
A method and apparatus for vacuum processing of a workpiece, the apparatus including a flow equalizer disposed in a vacuum processing chamber between a workpiece support pedestal and a pump port located in a wall of the vacuum processing chamber. In an embodiment, the flow equalizer has a first annular surface concentric about the workpiece support pedestal to provide conductance symmetry about the workpiece support even when the pump port is asymmetrically positioned within the vacuum processing chamber. In an embodiment, the flow equalizer has a second annular surface facing a lower surface of the workpiece support pedestal to restrict conductance as the flow equalizer is moved is response to a chamber pressure control signal. In an embodiment, the apparatus for vacuum processing of a workpiece includes tandem vacuum processing chambers sharing a vacuum pump with each tandem chamber including a flow equalizer to reduce cross-talk between the tandem chambers.