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:
Jul. 08, 1997
Filed:
Oct. 05, 1995
Michael H Bartlett, Hurst, TX (US);
Michael C Wuensch, Fort Worth, TX (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
An apparatus to improve upon the problem of mismatched CTEs in electrical circuits comprises a small heat sink (206), a substrate (202), and an aperture existing within the substrate (202). The heat sink (206) is located on one side of the substrate (202) in a location substantially overlapping the aperture (204). The transistor (106) is coupled to the heat sink (206) and extends through the aperture (204). The apparatus reduces manufacturing costs since no exotic bonding agents are needed to accommodate for the mismatch in CTEs. Additionally, the apparatus reduces the number of substrates required during the manufacturing process, and allows for the heat sink (206) to be soldered in an automated fashion to the bottom of the substrate (202) in much the same way component parts are reflowed onto the top of a printed circuit board.