Patent US4921054A successfully refreshed from Google Patents.
US4921054A
Expired / Lapsed
US
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Wiring board
Assignee: Boeing North American Inc
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Filing: 1988-10-21
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Granted: 1990-05-01
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Expires: 2008-10-21
Abstract
Abstract A multi-layered printing wiring board and a method for manufacture where the multi-layered printing wiring board has a thermal expansion controller Copper-Invar-Copper core therein with portions of the invar core therein with portions of the Invar being selectively removed and replaced with superior materials for plating conductive material there to and further having a reduced coefficient of thermal conductivity by providing for a noble metal layer to be selectively deposited on pre-determined positions on the Copper-Invar-Copper core thereby selectively etching portions of the copper and Invar up to the noble metal layer and thereby providing for selectively removing the Invar and replacing it with a laminant material.
Inventors
- 👤 Forrest L. Voss
- 👤 Donald R. Witherell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:39
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/44; H05K3/40; H05K3/42; H05K3/429; H05K3/46; H05K3/4611; H05K3/4641; H05K2201/00; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0338; H05K2201/0347; H05K2201/06; H05K2201/068; H05K2201/09; H05K2201/09209; H05K2201/095; H05K2201/09554; H05K2203/00; H05K2203/03; H05K2203/0323; H05K2203/0361; H05K2203/0384; H05K2203/06; H05K2203/061; H05K3/445; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49124; Y10T29/49155
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
103 words
A multi-layered printed wiring board comprising: a. a metallic core for controlling thermal expansion having a top side, bottom side and a plurality of holes therein; b. a noble metal layer disposed on the bottom side of the metallic core for inhibiting etching beyond said metallic core; c. a top side conductive layer disposed upon the top side of the metallic core; d. a bottom side conductive layer disposed upon the noble metal layer; e. a top side printed wiring board disposed upon the top side conductive layer; and f. a bottom side printed wiring board disposed upon the bottom side conductive layer.
Claim 2
Dependent Claim
103 words
A multi-layered printed wiring board comprising: a. a metallic core for controlling thermal expansion having a top side, bottom side and a plurality of holes therein; b. a noble metal layer disposed on the bottom side of the metallic core for inhibiting etching beyond said metallic core; c. a top side conductive layer disposed upon the top side of the metallic core; d. a bottom side conductive layer disposed upon the noble metal layer; e. a top side printed wiring board disposed upon the top side conductive layer; and f. a bottom side printed wiring board disposed upon the bottom side conductive layer.
Claim 3
Dependent Claim
26 words
A multi-layered printed wiring board of claim 1, further comprising; the metallic core being a metal selected from the group consisting of iron, Invar, and Covar.
Claim 4
Dependent Claim
16 words
A multi layered printed wiring board of claim 2 wherein the noble metal layer is gold.
Claim 5
Dependent Claim
17 words
A multi layered printed wiring board of claim 3 wherein the top side conductive layer is copper.
Claim 6
Dependent Claim
15 words
A multi-layered printed wiring board of claim 1 wheren the noble metal layer is gold.
Claim 7
Dependent Claim
16 words
A multi-layered printed wiring board of claim 1 wherein the top side conductive layer is copper.
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) | 1993-04-30 | 1993-10-30 | 1994-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-30 | 1997-10-30 | 1998-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-30 | 2001-10-30 | 2002-05-01 | $7700.00 | Window Closed / Lapsed |