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US4656003A Expired / Lapsed US ⏱️ 0.0 years remaining

Copper alloy and production of the same

Assignee: Kobe Steel Ltd
•
Filing: 1985-10-11
•
Granted: 1987-04-07
•
Expires: 2005-10-11
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Abstract

Abstract There is provided a copper alloy which comprises 1.0 to 3.5 wt. % of Ni, 0.2 to 0.9 wt. % of Si, 0.02 to 1.0 wt. % of Mn, 0.1 to 5.0 wt. % of Zn, 0.1 to 2.0 wt. % of Sn, and 0.001 to 0.01 wt. % of Mg, and 0.001 to 0.01 wt. % of one or more members selected from Cr, Ti, and Zr, with the remainder being substantially Cu. The copper alloy is suitable for lead frames for semiconductors and is also suitable for terminals and connectors. The copper alloy is produced by a process which comprises starting cooling from a temperature above 600° C. at a rate of 5° C. per second or higher after hot rolling of an ingot of said copper alloy, performing annealing at a temperature of 400° to 600° C. for 5 minutes to 4 hours after cold working, performing refining finish rolling, and performing annealing at a temperature of 400° to 600° C. for a short time of 5 to 60 seconds.

Inventors

  • 👤 Motohisa Miyafuji
  • 👤 Yasuhiro Nakashima
  • 👤 Satoru Katayama
  • 👤 Takashi Matsui
  • 👤 Hidekazu Harada
  • 👤 Youji Yuki

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-03 00:47
CPC Classifications
C; C22; C22C; C22C9/00; C22C9/06; C22F; C22F1/00; C22F1/08

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 69 words
A copper alloy which consists essentially of 1.0 to 3.5 wt% of Ni, 0.2 to 0.9 wt% of Si, 0.02 to 1.0 wt% of Mn, 0.1 to 5.0 wt% of Zn, 0.1 to 2.0 wt% of Sn, 0.001 to 0.01 wt% of Mg, and 0.001 to 0.01 wt% of at least one member selected from the group consisting of Cr, Ti, and Zr, with the remainder being substantially Cu.
Claim 2
Dependent Claim 69 words
A copper alloy which consists essentially of 1.0 to 3.5 wt% of Ni, 0.2 to 0.9 wt% of Si, 0.02 to 1.0 wt% of Mn, 0.1 to 5.0 wt% of Zn, 0.1 to 2.0 wt% of Sn, 0.001 to 0.01 wt% of Mg, and 0.001 to 0.01 wt% of at least one member selected from the group consisting of Cr, Ti, and Zr, with the remainder being substantially Cu.
Claim 3
Dependent Claim 12 words
A lead frame for semiconductors comprised of the alloy of claim 1.
Claim 4
Dependent Claim 69 words
A copper alloy which consists essentially of 1.0 to 3.5 wt% of Ni, 0.2 to 0.9 wt% of Si, 0.01 to 1.0 wt% of Mn, 0.1 to 5.0 wt% of Zn, 0.1 to 2.0 wt% of Sn, 0.001 to 0.01 wt% of Mg, and 0.001 to 0.01 wt% of at least one member selected from the group consisting of Cr, Ti, and Zr, with the remainder being substantially Cu.
Claim 5
Dependent Claim 69 words
A copper alloy which consists essentially of 1.0 to 3.5 wt% of Ni, 0.2 to 0.9 wt% of Si, 0.01 to 1.0 wt% of Mn, 0.1 to 5.0 wt% of Zn, 0.1 to 2.0 wt% of Sn, 0.001 to 0.01 wt% of Mg, and 0.001 to 0.01 wt% of at least one member selected from the group consisting of Cr, Ti, and Zr, with the remainder being substantially Cu.
Claim 6
Dependent Claim 11 words
Terminals and connectors therefor comprised of the alloy of claim 3.

References Cited (Backward Citations)

US31180A Cited
USRE31180E Cited
JPS599144A Cited
JPS59145749A Cited
JPS60152646A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1990-04-06 1990-10-06 1991-04-07 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1994-04-06 1994-10-06 1995-04-07 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1998-04-06 1998-10-06 1999-04-07 $7700.00 Window Closed / Lapsed

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