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US4869758A
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Iron/copper/chromium alloy material for high-strength lead frame or pin grid array
Assignee: Nippon Steel Corp
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Filing: 1988-05-25
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Granted: 1989-09-26
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Expires: 2008-05-25
Abstract
Abstract An iron/copper/chromium alloy material for a high-strength lead frame or pin grid array, which comprises 20 to 90% by weight of Cu and 2.5 to 12% by weight of Cr, with the balance being mainly iron, and which has an average grain size number of at least 10 in each of the iron/chromium phase and the copper phase, is prepared by continuous casting, cold-working, and aging.
Inventors
- 👤 Kunio Watanabe
- 👤 Satoshi Nishimura
- 👤 Kunishige Kaneko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:21
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/20; C22C9/00; H; H10; H10W; H10W70/00; H10W70/01; H10W70/04; H10W70/40; H10W70/456
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
65 words
An iron/copper/chromium alloy material for a high-strength lead frame or pin grid array, which comprises 20 to 90% by weight of Cu and 2.5 to 12% by weight of Cr, with the balance being iron and unavoidable impurities, wherein said alloy material comprises an iron/chromium phase and a copper phase each of which has a grain size number of at least 10 on the average.
Claim 2
Dependent Claim
65 words
An iron/copper/chromium alloy material for a high-strength lead frame or pin grid array, which comprises 20 to 90% by weight of Cu and 2.5 to 12% by weight of Cr, with the balance being iron and unavoidable impurities, wherein said alloy material comprises an iron/chromium phase and a copper phase each of which has a grain size number of at least 10 on the average.
Claim 3
Dependent Claim
77 words
An iron/copper/chromium alloy material as set forth in claim 1, wherein at least one element selected from the group consisting of Si, Al, Ti, Ni, Zn, Sn, Nb, Zr and P is further incorporated, the amount of Al, Ti, Nb, Zr or P being from 0.01% to 0.5% by weight, the amount of Zn or Si being from 0.01% to 1% by weight and the amount of Ni or Sn being from 0.01% to 4% by weight.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-25 | 1993-03-27 | 1993-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-25 | 1997-03-27 | 1997-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-25 | 2001-03-27 | 2001-09-26 | $7700.00 | Window Closed / Lapsed |