US3839231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air fireable compositions containing vanadium oxide and boron silicide, and devices therefrom
Assignee: EIDP Inc
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Filing: 1972-04-27
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Granted: 1974-10-01
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Expires: 1992-04-27
Abstract
Abstract Screen printable, air fireable compositions comprising (1) vanadium glass or a product of silica and vanadium glass, (2) boron silicide and (3), as optional components, boron, noble metal and/or a low melting inorganic binder, wherein the glass contains 5-55 percent vanadium metal content. Electronic devices are made from these compositions. A unique feature of the devices is their sensitivity to voltage as well as temperature. Consequently, the fired compositions are particularly useful wherever switching devices are needed, e.g., as transient suppressors in electronic equipment. A process for making electrical devices by firing subject compositions on substrates in a belt furnace.
Inventors
- 👤 F Patterson
- 👤 S Thayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:24
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/04; H01C7/042; H01C7/043; H01C7/047; H01B; H01B1/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
137 words
A SCREEN PRINTABLE, AIR FIREABLE COMPOSITION USEFUL FOR PREPARING THERMAL SWITCHES, COMPRISING, ON A WEIGHT BASIS, (1) 35-99 PERCENT OF A POWDERY PRODUCT OF VANADIUM GLASS AND SILICA, (2) 1-15 PERCENT FINELY DIVIDED COMPOUND(S) OF THE FORMULA BXSI, WHERE X IS ABOUT 4-6, (3) 0-50 PERCENT OF FINELY DIVIDED NOBLE METAL, AND (4) 0-20 PERCENT LOW MELTING INORGANIC BINDER; WHEREIN VANADIUM GLASS (1) CONTAINS 5-55 PERCENT VANADIUM. CALCULATED AS METAL; AND WHEREIN SAID POWDERY PRODUCT OF VANADIUM GLASS AND SILICA IS OBTANED BY HEATING VANADUM GLASS AND SILICA AT OR ABOVE THE SOFTENING POINT OF THE VANADIUM GLASS, THE SILICA HAVING AN AVERAGE PARTICLE SIZE OF NO MORE THAN ABOUT 40 MICRONS, THE AMOUNT OF SILICA USES TO PRODUCE SAID POWDERY PRODUCT BEING NO MORE THAN ABOUT 40 PERCENT OF THE WEIGHT OF THE VANADIUM GLASS THEREIN.
Claim 2
Dependent Claim
137 words
A SCREEN PRINTABLE, AIR FIREABLE COMPOSITION USEFUL FOR PREPARING THERMAL SWITCHES, COMPRISING, ON A WEIGHT BASIS, (1) 35-99 PERCENT OF A POWDERY PRODUCT OF VANADIUM GLASS AND SILICA, (2) 1-15 PERCENT FINELY DIVIDED COMPOUND(S) OF THE FORMULA BXSI, WHERE X IS ABOUT 4-6, (3) 0-50 PERCENT OF FINELY DIVIDED NOBLE METAL, AND (4) 0-20 PERCENT LOW MELTING INORGANIC BINDER; WHEREIN VANADIUM GLASS (1) CONTAINS 5-55 PERCENT VANADIUM. CALCULATED AS METAL; AND WHEREIN SAID POWDERY PRODUCT OF VANADIUM GLASS AND SILICA IS OBTANED BY HEATING VANADUM GLASS AND SILICA AT OR ABOVE THE SOFTENING POINT OF THE VANADIUM GLASS, THE SILICA HAVING AN AVERAGE PARTICLE SIZE OF NO MORE THAN ABOUT 40 MICRONS, THE AMOUNT OF SILICA USES TO PRODUCE SAID POWDERY PRODUCT BEING NO MORE THAN ABOUT 40 PERCENT OF THE WEIGHT OF THE VANADIUM GLASS THEREIN.
Claim 3
Dependent Claim
62 words
A composition according to claim 1 wherein component (2) additionally comprises finely divided boron with one or more compounds BxSi in finely divided form, the total amount of boron and BxSi being in the range of 1-15 percent, and the total amount of elemental boron in component (2) being no more than about 40 percent of the total weight of component (2).
Claim 4
Dependent Claim
15 words
A composition in accordance with claim 1 which is dispersed in an inert liquid vehicle.
Claim 5
Dependent Claim
15 words
A composition in accordance with claim 2 which is dispersed in an inerT liquid vehicle.
Claim 6
Dependent Claim
32 words
A composition in accordance with claim 1 wherein the amount of silica in said powdery product in claim 1 is in the range 10-25 percent of the weight of the vanadium glass.
Claim 7
Dependent Claim
32 words
A composition in accordance with claim 2 wherein the amount of silica in said powdery product in claim 2 is in the range 10-25 percent of the weight of the vanadium glass.
Claim 8
Dependent Claim
15 words
A composition in accordance with claim 5 which is dispersed in an inert liquid vehicle.
Claim 9
Dependent Claim
15 words
A composition in accordance with claim 6 which is dispersed in an inert liquid vehicle.
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) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |