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:
Feb. 03, 1987
Filed:
Dec. 20, 1983
Applicant:
Inventors:
Assignee:
Tokyo Shibaura Denki Kabushiki Kaisha, Kawasaki, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C22D / ;
U.S. Cl.
CPC ...
148411 ; 148412 ; 148413 ; 148414 ;
Abstract
A lead frame consists of a copper alloy containing 0.1 to 1% by weight of chromium and 0.001 to 0.5% by weight of zirconium and having a precipitate with a grain size of 0.5 to 50 .mu.m distributed therein at a rate of 1,000 to 10,000 grains/mm.sup.2. The lead frame is manufactured by casting a copper alloy containing 0.1 to 1% by weight of chromium and 0.001 to 0.5% by weight of zirconium by continuous casting, and performing rolling, a solution treatment, a cold working, and an age-hardening. The lead frame has an excellent bonding performance with an Au wire, hardness and bending strength, and is inexpensive.