Patent US3903344A successfully refreshed from Google Patents.
US3903344A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adherent solderable cermet conductor
Assignee: RCA Corp
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Filing: 1974-02-26
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Granted: 1975-09-02
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Expires: 1994-02-26
Abstract
Abstract An article comprising a ceramic substrate having an electrically conductive fired cermet type coating thereon, the coating having a lower layer which is glass-rich and an upper layer which has a low glass content.
Inventors
- 👤 Harry John Laiming
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:08
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/22; H05K3/24; H05K3/245; H05K3/247; H05K3/248; C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/52; C04B41/80; C04B41/81; C04B41/89; H01; H01B; H01B1/00; H01B1/14; H01B1/16; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
95 words
AN ARTICLE OF MANUFACTURE COMPRISING A REFACTORY METAL OXIDE DIELECTRIC SUBSTRATE HAVING DISPOSED ON A SURFACE THEREOF A COMPOSITE COATING COMPRISING A LOWER LAYER NOT MORE THAN ABOUT 0.4 MIL THICK AFTER FIRING, SAID LOWER LAYER CONSISTING ESSENTIALLY OF FROM ABOUT 10-100% NY WEIGHT OF GLASS AND FROM ABOUT 0-90% BY WEIGHT OF NOBLE METALS, SAID LOWER LAYER IS FUSED TO AN UPPER LAYER CONSISTING ESSENTIALLY OF 1-2% BY WEIGHT OF GLASS AND 98-99% BY WEIGHT OF NOBLE METALS, SAID UPPER LAYER HAVING A THICKNESS AFTER FIRING MORE THAN TWICE THAT OF SAID LOWER LAYER.
Claim 2
Dependent Claim
95 words
AN ARTICLE OF MANUFACTURE COMPRISING A REFACTORY METAL OXIDE DIELECTRIC SUBSTRATE HAVING DISPOSED ON A SURFACE THEREOF A COMPOSITE COATING COMPRISING A LOWER LAYER NOT MORE THAN ABOUT 0.4 MIL THICK AFTER FIRING, SAID LOWER LAYER CONSISTING ESSENTIALLY OF FROM ABOUT 10-100% NY WEIGHT OF GLASS AND FROM ABOUT 0-90% BY WEIGHT OF NOBLE METALS, SAID LOWER LAYER IS FUSED TO AN UPPER LAYER CONSISTING ESSENTIALLY OF 1-2% BY WEIGHT OF GLASS AND 98-99% BY WEIGHT OF NOBLE METALS, SAID UPPER LAYER HAVING A THICKNESS AFTER FIRING MORE THAN TWICE THAT OF SAID LOWER LAYER.
Claim 3
Dependent Claim
15 words
An article according to claim 1 including a coating of solder over said upper layer.
Claim 4
Dependent Claim
14 words
An article according to claim 1 in which said substrate is an alumina ceramic.
Claim 5
Dependent Claim
14 words
An article according to claim 1 in which said substrate is a beryllia ceramic.
Claim 6
Dependent Claim
24 words
An article according to claim 1 in which the composition of said glass includes oxides of bismuth, lead, cadmium, calcium, boron, aluminum, and silicon.
Claim 7
Dependent Claim
22 words
An article according to claim 5 in which said metals of said lower and upper layers consist essentially of platinum and gold.
Claim 8
Dependent Claim
14 words
An article according to claim 1 in which said lower layer is all glass.
Claim 9
Dependent Claim
16 words
An article according to claim 7 in which said lower layer is about 0.0001 inch thick.
References Cited (Backward Citations)
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US3537892A
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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) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |