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:
Sep. 28, 1999
Filed:
Mar. 25, 1997
Applicant:
Inventors:
Joong-do Kim, Kyungki-do, KR;
Young-ho Baek, Kyungki-do, KR;
Assignee:
Samsung Aerospace Industries, Ltd., Kyongsangnam-do, KR;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L / ; B32B / ;
U.S. Cl.
CPC ...
428675 ; 428620 ; 428670 ; 428672 ; 428674 ; 428929 ; 257666 ; 257677 ;
Abstract
A lead frame has a metal substrate directly coated with a palladium alloy layer to prevent diffusion of metal molecules from the metal substrate. The lead frame does not contain a nickel intermediate layer, thereby preventing the diffusion of nickel molecules which makes soldering difficult, and enhancing production.