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:
Nov. 10, 1998
Filed:
Sep. 23, 1997
Wyatt A Huddleston, Phoenix, AZ (US);
Andrew Szewczyk, Canyon Lake, TX (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
Process for maintaining lead positions within a glass layer of a CQFP semiconductor device by using a magnet during high temperature assembly operations. During lead embed, a magnet (46) is magnetically attached to lead frame (44). Upon reflow of a glass layer (48), leads (50) sink into the glass layer to a height controlled by the height (H) of a protrusion (52) of the magnet. A similar magnet (62) can be used to maintain the lead positions during a high temperature operation used to cure a die attach material (60). Yet another magnet (70) can be used to maintain the positions of leads (50) during a lid seal operation. A common magnet design for use in all thermal operations can instead be used. Use of the magnets restrict movement of the leads within the glass layer when the glass is in a softened state.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile