Thermistor compositions and thermistors made therefrom
Abstract
Abstract THE INVENTION RELATES TO THERMISTOR COMPOSITIONS WHICH, UPON BEING FIRED ONTO A CERAMIC SUBSTRATE, YIELD GLAZE THERMISTORS HAVING RESISTANCE VALUES OF FROM ABOUT 500 TO ABOUT 5,000 OHNS/SQUARE AND TEMPERATURE COEFFICIENT OF RESISTANCE VALUES OF FROM ABOUT - 5,000 TO - 700 P.P.M./*C., CONSISTING ESSENTIALLY OF: (I) 20 TO 50% OF A FINELY DIVIDED NOBLE METAL POWDER, AND (II) 50 TO 80% OF A FINELY DIVIDED INORGANIC BINDER POWDER. THE NOBLE METAL POWDER CONSISTS ESSENTIALLY OF (A) 15 TO 8.5% OF A FINELY DIVIDED PALLADIUM OR RUTHENIUM POWDER OR MIXTURE THEREOF, (B) 15 TO 85% OF A FINELY DIVIDED RHODIUM POWDER AND (C) 0 TO 12% OF A FINELY DIVIDED SILVER OR GOLD POWDER OR A MIXTURE THEREOF. THE CHOICE OF METALS, PROPORTIONS THEREOF AND PROPORTIONS OF INORGANIC BINDER ARE SELECTED TO PROVIDE THERMISTOR COMPOSITIONS WHICH THEN PRINTED AND FIRED WILL PRODUCE GLAZE THERMISTORS POSSESSING THE DESIRED RESISTANCES AND TEMPERATURE COEFFICIENTS OF RESISTANCE. ADDITIONALLY, AN INERT VEHICLE MAY ALSO BE INCLUDED TO DISPERSE THE POWDERS.
Inventors
- 👤 Oliver Alton Short
Bibliographic Details
Claims Analysis
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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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |