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:
Jun. 11, 2002
Filed:
Jun. 12, 2001
Raanan Y. Zehavi, Sunnyvale, CA (US);
Robert L. Davis, Belmont, CA (US);
David B. Ackard, San Jose, CA (US);
James W. Govorko, Sunnyvale, CA (US);
Integrated Materials, Inc., San Jose, CA (US);
Abstract
A method and apparatus for welding together two silicon workpieces ( ) without the formation of cracks along the weld. In a first embodiment, current ( ) is passed through one or both of the workpieces to heat them to between 600 and 900° C. Then an electric, laser, or plasma welder ( ) passes along the seam ( ) between the workpieces to weld them together. In a second embodiment, current ( ) is passed through a plate ( ), preferably formed of silicon, which either supports the workpieces or is brought into contact with at least one of them, whereby the workpieces are preheated prior to the welding operation.