Won M Choi

US Patent:

6805974, Oct 19, 2004

Filed:

Feb 15, 2002

Appl. No.:

10/078020

Inventors:

Won K. Choi - Mount Kisco NY
Charles C. Goldsmith - Poughkeepsie NY
Timothy A. Gosselin - Apalachin NY
Donald W. Henderson - Ithaca NY
Sung K. Kang - Chappaqua NY
Da-Yuan Shih - Poughkeepsie NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

B23K 3526

US Classification:

428646, 428647, 428648, 420560, 420557, 420561, 257780, 257738, 22818022, 228563

Abstract:

A solder composition and associated method of formation. The solder composition comprises a substantially lead-free alloy that includes tin (Sn), silver (Ag), and copper. The tin has a weight percent concentration in the alloy of at least about 90%. The silver has a weight percent concentration X in the alloy. X is sufficiently small that formation of Ag Sn plates is substantially suppressed when the alloy in a liquefied state is being solidified by being cooled to a lower temperature at which the solid Sn phase is nucleated. This lower temperature corresponds to an undercooling T relative to the eutectic melting temperature of the alloy. Alternatively, X may be about 4. 0% or less, wherein the liquefied alloy is cooled at a cooling rate that is high enough to substantially suppress Ag Sn plate formation in the alloy. The copper has a weight percent concentration in the alloy not exceeding about 1. 5%.

US Patent:

46191259, Oct 28, 1986

Filed:

Jul 6, 1984

Appl. No.:

6/628472

Inventors:

Won H. Choi - New York NY

International Classification:

E05B 1924

US Classification:

70460

Abstract:

A key holder having a main body portion with an eyelet-like extension extending from one end thereof through which a chain or other element can be inserted to support one or more objects such as keys and the like and wherein an elongated channel is provided in the body portion extending along a substantial length of the body but terminating from the edge thereof adjacent the eyelet portion in which channel a plurality of individual indicia bearing slide elements may be selectively received and locked therein by means of an adjustable locking member.