Patent US3664868A successfully refreshed from Google Patents.
US3664868A
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US
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Gold metallizing of refractory metals on ceramic substrates
Assignee: American Lava Corp
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Filing: 1970-03-16
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Granted: 1972-05-23
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Expires: 1990-03-16
Abstract
Abstract Substrates having patterns of refractory metals, such as tungsten, molybdenum or molybdenum-manganese, are clad with gold which is congruent to the refractory metal pattern by screenprinting a gold ink essentially free from other inorganic constituents over the refractory metal pattern and then firing to a temperature above the melting point of gold. Exactly congruent gold layers having a smooth fire-polished surface are thus obtained. The method is equally applicable to terminals which are readily accessible to barrel plating and to terminals which are inaccessible to normal barrel plating procedures.
Inventors
- 👤 M Paul Davis
- 👤 Paul R Theobald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:23
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/22; H05K3/24; H05K3/245; H05K3/247; H05K3/248; H05K1/00; H05K1/02; H05K1/09; H05K1/092; H10; H10N; H10N97/00; H10W; H10W70/00; H10W70/01; H10W70/05; H10W70/098; H05K1/03; H05K1/0306; H05K2201/00; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/035; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/926; Y10T; Y10T428/00; Y10T428/12; Y10T428/12389; Y10T428/12396; Y10T428/12493; Y10T428/12535; Y10T428/12611; Y10T428/12618; Y10T428/12771; Y10T428/12806; Y10T428/12812; Y10T428/12861; Y10T428/12889; Y10T428/12993
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
24 words
Process according to claim 1 wherein the ink contains about 80 percent by weight of finely divided gold of at least 99 percent purity.
Claim 2
Dependent Claim
17 words
Process according to claim 1 wherein the firing temperature is from about 1,063* to about 1,200* C.
Claim 3
Dependent Claim
39 words
A composite ceramic substrate having a pattern of refractory metal conductors and terminals and adhered thereto and exactly congruent therewith a fire-polished gold cladding from about four to about ten microns thick produced by the process of claim 1.
Claim 4
Dependent Claim
16 words
A composite ceramic substrate according to claim 4 wherein the refractory metal is tungsten or molybdenum-manganese.
References Cited (Backward Citations)
US3539114A
Cited
US3529350A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |