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. 12, 1985
Filed:
Feb. 07, 1983
Tadao Kushima, Ibaraki, JP;
Masahiro Gooda, Hitachi, JP;
Tasao Soga, Hitachi, JP;
Toshitaka Yamamoto, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A method of forming a number of discrete solder layers on a semiconductor wafer of a large area. A number of regions which are easy to be wetted with solder are formed on one of the major surfaces of the wafer. A solder foil is positioned on the one major surface and a plate-like jig including a plate and projections formed on one surface thereof is disposed on the solder foil with the projections facing the latter. By heating the stacked assembly at a sufficiently high temperature for the solder foil to be molten, a number of the discrete solder layers having a uniform thickness are formed on the semiconductor wafer.