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:
Mar. 30, 1993
Filed:
Dec. 10, 1990
Maurice H Hanes, Murrysville, PA (US);
Rowland C Clarke, Bell Township, PA (US);
Michael C Driver, Elizabeth Township, PA (US);
Westinghouse Electric Corp., Pittsburgh, PA (US);
Abstract
A bonded structure is described consisting of a semiconductor wafer, preferably gallium arsenide, soldered to a substrate material. A method for forming the structure is also described. The structure provides mechanical support and thermal conductivity for the wafer, as well as a multitude of connections through the substrate material at predetermined locations on the wafer. The substrate material and the soldering process are selected to minimize the resulting stresses in the wafer. A pattern of pads consisting of a refractory metal covered by a solder material is formed on the substrate to maintain space for excess solder in order to avoid the shorting of the individual connections on the wafer, and to control the size and location of voids in the solder upon solidification.