US4912284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical circuits
Assignee: US Philips Corp
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Filing: 1988-08-16
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Granted: 1990-03-27
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Expires: 2008-08-16
Abstract
Abstract A hybrid or printed circuit is formed on a substrate (1) which comprises an iron-chromium-aluminum alloy which may also contain Yttrium and which forms a stable inert strongly adhering ceramic layer (5,6) on its exposed surfaces when heated in an oxidizing atmosphere in order to produce a hybrid circuit a dielectric paste is printed on the ceramic surface (5) of the alloy to form a platform (9). Conductors (10,11) are then printed on the dielectric platform (9) and fired. One or more component(s) (8) is/are then soldered to the conductors.
Inventors
- 👤 Christopher J. Ransom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:21
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/05; H05K1/053; H10; H10W; H10W70/00; H10W70/60; H10W70/67; H10W70/68; H10W70/6875; H10W90/00; H05K1/09; H05K1/092; H05K2203/00; H05K2203/03; H05K2203/0315
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
76 words
An electrical circuit comprising electrical conductors formed on an electrically insulating surface of a substrate characterized in that the substrate comprises an alloy of iron, chromium, aluminum and yttrium which, when heated in an oxidizing atmosphere, forms electrically insulating ceramic layers on its exposed surfaces, and an electrically insulating ceramic layer formed by heating said alloy in an oxidizing atmosphere, and that the electrical conductors are formed of an electrically conductive material other than said alloy.
Claim 2
Dependent Claim
76 words
An electrical circuit comprising electrical conductors formed on an electrically insulating surface of a substrate characterized in that the substrate comprises an alloy of iron, chromium, aluminum and yttrium which, when heated in an oxidizing atmosphere, forms electrically insulating ceramic layers on its exposed surfaces, and an electrically insulating ceramic layer formed by heating said alloy in an oxidizing atmosphere, and that the electrical conductors are formed of an electrically conductive material other than said alloy.
Claim 3
Dependent Claim
14 words
A circuit as claimed in claim 1 in which the alloy additionally comprises Silicon.
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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) | 1993-03-26 | 1993-09-25 | 1994-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-26 | 1997-09-25 | 1998-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-26 | 2001-09-25 | 2002-03-27 | $7700.00 | Window Closed / Lapsed |