US4318740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low alloy lead frame
Assignee: Nippon Gakki Co Ltd
•
Filing: 1980-01-29
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Granted: 1982-03-09
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Expires: 2000-01-29
Abstract
Abstract Lead frame of sufficient mechanical strength, lowered cost, excellent plating affinity and enhanced anticorrosion is obtained through increased contents of P and Cu and remarkably reduced content of Ni or Cr even without employment of the preparative Ni strike plating necessitated in the prior art.
Inventors
- 👤 Tomoyuki Koyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:25
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/002; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12528; Y10T428/12771; Y10T428/12861; Y10T428/12889; Y10T428/12896
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
58 words
An improved lead frame containing 0.30 to 1.50% by weight for Cr; 0.20 to 1.0% by weight for Ni; 0.15 to 0.75% by weight for Si; 0.08 to 0.15% by weight for Ti; 0.05 to 0.60% by weight of P; 0.04 to 0.70% by weight of Cu; up to 0.19% by weight of C; and the balance Fe.
Claim 2
Dependent Claim
58 words
An improved lead frame containing 0.30 to 1.50% by weight for Cr; 0.20 to 1.0% by weight for Ni; 0.15 to 0.75% by weight for Si; 0.08 to 0.15% by weight for Ti; 0.05 to 0.60% by weight of P; 0.04 to 0.70% by weight of Cu; up to 0.19% by weight of C; and the balance Fe.
Claim 3
Dependent Claim
42 words
The improved lead frame of claim 1 in which the amount of chromium is 0.32-1.42% by weight, the amount of nickel is 0.27-0.9% by weight, the amount of silicon is 0.19-0.71% by weight and the amount of titanium is 0.10-0.15% by weight.
Claim 4
Dependent Claim
34 words
The improved lead frame of claim 2 in which the amount of phosphorus is 0.06-0.59% by weight, the amount of copper is 0.09-0.67% by weight, and the amount of carbon is 0.08-0.1% by weight.
Claim 5
Dependent Claim
40 words
The improved lead frame of claim 3 in which the chromium is 1.01 weight percent, the amount of nickel is 0.57 weight percent, the amount of silicon is 0.35 weight percent and the amount of titanium is 0.10 weight percent.
Claim 6
Dependent Claim
34 words
The improved lead frame of claim 3 in which the chromium is 0.32 weight percent, the nickel is 0.27 weight percent, the silicon is 0.19 weight percent and the titanium is 0.10 weight percent.
Claim 7
Dependent Claim
34 words
The improved lead frame of claim 3 in which the chromium is 1.42 weight percent, the nickel is 0.90 weight percent, the silicon is 0.71 weight percent and the titanium is 0.15 weight percent.
References Cited (Backward Citations)
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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) | 1985-03-08 | 1985-09-07 | 1986-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-08 | 1989-09-07 | 1990-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-08 | 1993-09-07 | 1994-03-09 | $7700.00 | Window Closed / Lapsed |