US3634202A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of thick film conductors and circuits incorporating such conductors
Assignee: Lignes Telegraphiques et Telephoniques LTT SA
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Filing: 1970-05-19
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Granted: 1972-01-11
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Expires: 1990-05-19
Abstract
Abstract The thick film conductive circuit is obtained by first depositing on a substrate a thin underlayer of a film-forming metal and secondly a thin film of the metal to constitute the pattern of the circuit which is then photoetched in said layer. The bare portion of the underlayer is then oxidized and the conductive pattern is electrolytically thickened. This process requires only one mask.
Inventors
- 👤 Pierre Michelet
- 👤 Jean Joly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:15
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/10; H05K3/108; H01; H01B; H01B1/00; H05K3/02; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; H05K2203/00; H05K2203/03; H05K2203/0315; H05K2203/11; H05K2203/1142; H05K3/38; H05K3/388; Y; Y10; Y10S; Y10S148/00; Y10S148/043; Y10S148/106
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
35 words
A process for the manufacturing of thick film conductive circuits on an insulating substrate according to claim 1 comprising the following further step: terminating the oxidation of said underlayer part uncovered by the conductive pattern.
Claim 2
Dependent Claim
32 words
A process for the manufacturing of thick film conductive circuits according to claim 1 comprising the following further step: removing the parts of the partially oxidized layer uncovered by said conductive pattern.
Claim 3
Dependent Claim
68 words
A process for the manufacturing of thick film conductive circuits on a conductive substrate comprising the following steps: cleaning said substrate; vacuum depositing first a thin underlayer of an oxidizable metal and second a thin layer of a conductive metal; photoengraving said thin conductive layer so as to produce the pattern of the circuit; oxidizing the parts of the underlayer uncovered by said pattern; electrolytically thickening said pattern.
Claim 4
Dependent Claim
25 words
A thick film conductive circuit manufactured according to claim 1 in which said substrate is of ceramics, said underlayer of tantalum, said layer of gold.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |