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:
May. 13, 2003
Filed:
Sep. 06, 2000
Applicant:
Inventors:
Martin M. Barrera, Santa Clara, CA (US);
George Kamian, Santa Cruz, CA (US);
Edward J. McInerney, San Jose, CA (US);
Craig L. Stevens, Ben Lomond, CA (US);
Assignee:
Novellus Systems, Inc., San Jose, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F27D 5/00 ;
U.S. Cl.
CPC ...
F27D 5/00 ;
Abstract
Bowing of semiconductor wafers during heating is reduced by heating the wafers in a gas with a thermal conductivity and mean free path greater than that of oxygen, or by heating the wafers in a processing chamber under a pressure less than 0.1 Torr. In one embodiment, the high thermal conductivity gas is helium and heating in the helium takes place at a pressure less than 2.4 Torr.