US3615734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brazeable compositions
Assignee: EIDP Inc
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Filing: 1968-11-01
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Granted: 1971-10-26
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Expires: 1988-11-01
Abstract
Abstract The brazeable compositions for metallizing ceramic bodies comprising noble metals and a low-alkali aluminosilicate glass, wherein said glass consists essentially of SiO2, A12O3, MgO, CaO and Na2O. Optional amounts of BaO, B2O3 and K2O may also be included in the glass compositions. Critical proportionate amounts of metal: glass and the various oxides are required. These brazeable metallizing compositions can be fired in air, at temperatures of at least 900* C. and yet be brazeable without the need for electroplating; the fired brating compositions are able to withstand reducing atmospheres of a brazing furnace and also compatible with conventional brazing alloys (e.g., Ag-Cu).
Inventors
- 👤 George Rolland Cole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:35
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/14; H01B1/16; C; C04; C04B; C04B41/00; C04B41/45; C04B41/50; C04B41/51; C04B41/5183
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
16 words
A brazeable composition in accordance with claim 1 which is dispersed in an inert liquid vehicle.
Claim 2
Dependent Claim
31 words
A brazeable composition in accordance with claim 1 wherein the glass consists essentially of, in weight percent, approximately 57% SiO2, 20.5% A12O3, 12% MgO, 5.5% CaO, 4% B2O3 and 1% Na2O.
Claim 3
Dependent Claim
38 words
A brazeable composition in accordance with claim 1 wherein said noble metal contains at least 50% platinum having a surface area within the range of 0.05-5 m.2/g., and wherein said low-alkali aluminosilicate glass is in finely divided form.
Claim 4
Dependent Claim
16 words
A brazeable composition in accordance with claim 4 which is dispersed in an inert liquid vehicle.
Claim 5
Dependent Claim
15 words
A brazeable composition in accordance with claim 4 wherein the noble metal is degassed platinum.
References Cited (Backward Citations)
US3407081A
Cited
US3502489A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |