US4289829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for metallizing ceramic substrates and new, thus obtained products
Assignee: Silec Semi Conducteurs SA
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Filing: 1979-06-25
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Granted: 1981-09-15
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Expires: 1999-06-25
Abstract
Abstract Method of metallizing a ceramic substrate so as to obtain on this substrate weldable metallized zones or areas usable at a high temperature, characterized by depositing on a ceramic substrate, an ink including cobalt oxide and forming a hooking layer by forming a compound between the ceramic and cobalt oxide, under an oxidizing atmosphere, and, reducing at about 1,100° C., the oxide superficially so as to obtain a cobalt metal layer and metallized zones or areas weldable by a method known per se.
Inventors
- 👤 Pierre C. Rossetti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:54
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B37/00; C04B37/02; C04B37/023; C04B37/026; C04B41/45; C04B41/50; C04B41/51; C04B41/5144; C04B41/80; C04B41/81; C04B41/85; C04B41/88; H; H10; H10W; H10W70/00; H10W70/01; H10W70/05; H10W70/098; C04B2235/00; C04B2235/65; C04B2235/658; C04B2235/6582; C04B2237/00; C04B2237/02; C04B2237/12; C04B2237/123; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/343; C04B2237/50; C04B2237/60; C04B2237/70; C04B2237/708; H05; H05K; H05K1/00; H05K1/02; H05K1/09; H05K1/092; H05K3/00; H05K3/22; H05K3/24; H05K3/245; H05K3/38
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
87 words
A method of metallizing an alumina substrate to obtain weldable metallized zones or areas thereon usable at a high temperature, said method consisting essentially in the sequential steps of: (a) depositing on said substrate an ink composed of a dispersion of a cobalt oxide in collodion, (b) forming a compound between said substrate and cobalt oxide, in an oxidizing atmosphere, at about 1,100° C., and thereafter (c) reducing the oxide superficially to obtain a cobalt metal layer on which weldable metallized zones or areas may be deposited.
Claim 2
Independent Claim
87 words
A method of metallizing an alumina substrate to obtain weldable metallized zones or areas thereon usable at a high temperature, said method consisting essentially in the sequential steps of: (a) depositing on said substrate an ink composed of a dispersion of a cobalt oxide in collodion, (b) forming a compound between said substrate and cobalt oxide, in an oxidizing atmosphere, at about 1,100° C., and thereafter (c) reducing the oxide superficially to obtain a cobalt metal layer on which weldable metallized zones or areas may be deposited.
Claim 3
Dependent Claim
30 words
A method according to claim 1, wherein a mixture of Co 2 O 3 and Co 3 O 4 is dispersed in a nitrocellulose solution in a butylcarbitol acetate solvent.
Claim 4
Dependent Claim
18 words
A method according to claim 1, wherein the ink is deposited onto the substrate by a serigraphy method.
Claim 5
Dependent Claim
18 words
A method according to claim 3, wherein after the deposition, the ink is dried prior to step (b).
Claim 6
Dependent Claim
19 words
A method according to claim 1, step (b) is carried out in an air atmosphere for about 15 minutes.
Claim 7
Dependent Claim
17 words
An alumina ceramic substrate comprising weldable metallized zones or areas obtained by the method of claim 1.
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) | 1984-09-14 | 1985-03-16 | 1985-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-14 | 1989-03-16 | 1989-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-14 | 1993-03-16 | 1993-09-15 | $7700.00 | Window Closed / Lapsed |