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:
Sep. 25, 2001
Filed:
Mar. 22, 1999
John MacKay, San Jose, CA (US);
Tom Molinaro, Fremont, CA (US);
Spheretek, LLC, Sunnyvale, CA (US);
Abstract
A mask (,; see also,) having a plurality of openings (cells) is disposed on, or nearly on, the surface of a substrate (,), the openings (,) of the mask being aligned over a corresponding plurality of pads (,) on the substrate. The openings in the mask are filled with solder material (,). A pressure plate (,) is disposed over the mask to capture the solder material in the cells. Heat is directed at the mask (through the pressure plate) to reflow the solder. This is done in an inverted or partially inverted orientation. The stackup (assembly) of substrate/mask/pressure plate may be un-inverted prior to cooling. Mask configurations, methods of mounting the masks, and solder material compositions are described. The methods are robust, and are well suited to fine pitch as well as coarse pitch ball bumping of substrates.