US3929491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bonded silver article, composition, and method of bonding silver to a ceramic substrate
Assignee: Electro Oxide Corp
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Filing: 1974-01-24
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Granted: 1975-12-30
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Expires: 1994-01-24
Abstract
Abstract A composition for, as well as a method of bonding silver to a ceramic substrate and a bonded silver article which includes a composition of silver, cadmium oxide, copper oxide, rhuthenium oxide and platinum. An initial mixture of between 0.5%-5.0% by weight of the total composition of cadmium oxide and copper oxide is provided in predetermined weight ratios. The initial mixture is blended with between 0.25%-2.0% of platinum powder and 0.50%4.0% rhuthenium oxide to form an intermediate mixture. Silver powder is added to form the total composition mixture. The total composition mixture is blended in an organic binder and applied to a ceramic substrate. The coated ceramic article is within a temperature range of 860* to 925*C. Copper oxide crystals impregnate the ceramic substrate and form a high strength bond between the silver layer and the ceramic substrate. It is believed that the platinum forms an alloy with the rhuthenium so that there is little leaching of the silver coating when solder is applied.
Inventors
- 👤 Baynard R Smith
- 👤 Arnold W Treptow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:02
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/80; C04B41/81; C04B41/85; C04B41/88; C04B37/00; C04B37/02; C04B37/023; C04B37/026; C04B41/009; C04B41/45; C04B41/50; C04B41/51; C04B41/5116; H; H05; H05K; H05K1/00; H05K1/02; H05K1/09; H05K1/092; H10; H10D; H10D84/00; H10D84/01; C04B2237/00; C04B2237/02; C04B2237/12; C04B2237/125; C04B2237/126; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/343; C04B2237/40; C04B2237/408; C04B2237/50; C04B2237/72
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
142 words
A MEALTLIZING COMPOSITION COMPRISING AN INTIMATE MIXTURE ON A WEIGHT BASIS, OF: (A) ABOUT 0.5%-5.0% OF AN INITIAL MIXTURE OF CADMIUM OXIDE POWDER AND AT LEAST ONE COPPER OXIDE POWDER SELECTED FROM THE GROUP CONSISTING OF CUPROUS OXIDE AND CUPIC OXIDE, SAID COPPER OXIDE AND CADMIUM OXIDE BEING COMBINED IN A WEIGHT RADIO OF BETWEEN 0.15-6.0 PARTS OF SAID COPPER OXIDE TO 1.0 PART OF SAID CADMIUM OXIDE; (B) ABOUT 0.25%-2.0% OF AT LEAST ONE PARTICULATE MATERIAL SELECTED FROM THE GROUP CONSISTING OF PLATINUM, IRIDIUM, RHODIUM, AND OSMIUM POWDER; (C) ABOUT 0.50%-4.0% OF RHUTHENIUM OXIDE; (D) THE BALANCE OF SAID INTIMATE MIXTURE BEING AT LEAST ONE SILVER PARTICULATE MATERIAL SELECTED FROM THE GROUP CONSISTING OF OF SILVER AND SILVER OXIDE; AND, SAID METALIZING COMPOSITION FURTHER INCLUDING ABOUT 10.0%-95.0% BY WEIGHT OF SAID INTIMATE MIXTURE OF AN ORGANIC BINDER DEVOID OF GLASS FRITS.
Claim 2
Dependent Claim
142 words
A MEALTLIZING COMPOSITION COMPRISING AN INTIMATE MIXTURE ON A WEIGHT BASIS, OF: (A) ABOUT 0.5%-5.0% OF AN INITIAL MIXTURE OF CADMIUM OXIDE POWDER AND AT LEAST ONE COPPER OXIDE POWDER SELECTED FROM THE GROUP CONSISTING OF CUPROUS OXIDE AND CUPIC OXIDE, SAID COPPER OXIDE AND CADMIUM OXIDE BEING COMBINED IN A WEIGHT RADIO OF BETWEEN 0.15-6.0 PARTS OF SAID COPPER OXIDE TO 1.0 PART OF SAID CADMIUM OXIDE; (B) ABOUT 0.25%-2.0% OF AT LEAST ONE PARTICULATE MATERIAL SELECTED FROM THE GROUP CONSISTING OF PLATINUM, IRIDIUM, RHODIUM, AND OSMIUM POWDER; (C) ABOUT 0.50%-4.0% OF RHUTHENIUM OXIDE; (D) THE BALANCE OF SAID INTIMATE MIXTURE BEING AT LEAST ONE SILVER PARTICULATE MATERIAL SELECTED FROM THE GROUP CONSISTING OF OF SILVER AND SILVER OXIDE; AND, SAID METALIZING COMPOSITION FURTHER INCLUDING ABOUT 10.0%-95.0% BY WEIGHT OF SAID INTIMATE MIXTURE OF AN ORGANIC BINDER DEVOID OF GLASS FRITS.
Claim 3
Dependent Claim
16 words
The metallizing composition as recited in claim 1 wherein said copper oxide powder is cuprous oxide.
Claim 4
Dependent Claim
34 words
The metallizing composition as recited in claim 2 wherein said weight percentage of said mixture of said cadmium oxide and said copper oxide is within the approximate range between 0.5%-2.0% of said intimate mixture.
Claim 5
Dependent Claim
36 words
The metallizing composition as recited in claim 3 wherein said weight ratio of said copper oxide and said cadmium oxide mixture is between 2.0-4.0 parts of said copper oxide to 1.0 part of said cadmium oxide.
Claim 6
Dependent Claim
27 words
The metallizing composition as recited in claim 3 wherein said weight percentage of said platinum powder is within the approximate range between 0.5%-1.0% of said intimate mixture.
Claim 7
Dependent Claim
27 words
The metallizing composition as recited in claim 5 wherein said weight percentage of said rhuthenium oxide is within the approximate range between 0.50%-2.0% of said intimate mixture.
Claim 8
Dependent Claim
22 words
The metallizing composition as recited in claim 6 wherein said weight percentage of said rhuthenium oxide approximates 1.0% of said intimate mixture.
Claim 9
Dependent Claim
16 words
The metallizing composition as recited in claim 1 wherein said copper oxide powder is cupric oxide.
Claim 10
Dependent Claim
34 words
The metallizing composition as recited in claim 8 wherein said weight percentage of said mixture of said cadmium oxide and said copper oxide is within the approximate range between 0.5%-2.0% of said intimate mixture.
Claim 11
Dependent Claim
36 words
The metallizing composition as recited in claim 9 wherein said weight ratio of said copper oxide and said cadmium oxide mixture is between 2.0-4.0 parts of said copper oxide to 1.0 part of said cadmium oxide.
Claim 12
Dependent Claim
27 words
The metallizing composition as recited in claim 9 wherein said weight percentage of said platinum powder is within the approximate range between 0.5%-1.0% of said intimate mixture.
Claim 13
Dependent Claim
27 words
The metallizing composition as recited in claim 11 wherein said weight percentage of said rhuthenium oxide is within the approximate range between 0.50%-2.0% of said intimate mixture.
Claim 14
Dependent Claim
22 words
The metallizing composition as recited in claim 12 wherein said weight percentage of said rhuthenium oxide approximates 1.0% of said intimate mixture.
Claim 15
Dependent Claim
22 words
The metallizing composition as recited in claim 13 wherein said weight percentage of said platinum powder approximates 0.5% of said intimate mixture.
Claim 16
Dependent Claim
29 words
The metallizing composition as recited in claim 14 wherein said weight percentage of said mixture of said cadmium oxide and said copper oxide approximates 1.0% of said intimate mixture.
Claim 17
Dependent Claim
36 words
The metallizing composition as recIted in claim 15 wherein said weight ratio of said copper oxide and said cadmium oxide mixture is approximately 3.0 parts of said copper oxide to 1.0 part of said cadmium oxide.
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) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |