US3341473A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High beta thermistors
Assignee: Unifrax I LLC
•
Filing: 1966-02-16
•
Granted: 1967-09-12
•
Expires: 1986-02-16
Abstract
No abstract record available.
Inventors
- 👤 Luther D Loch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:31
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/04; H01C7/042; H01C7/043
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
170 words
A THERMISTOR SUITABLE FOR USE AS HIGH TEMPERATURE FLAME SENSOR WHICH CONSISTS OF A BODY AND A PAIR OF LEADS ATTACHED THERETO, SAID BODY CONSISTING ESSENTIALLY OF: (A) A SOLID SOLUTION OF OXIDES OF POLYVALENT METALS REPRESENTED BY THE FORMULA MO2M''O''2 WHRE M AND M ARE DIFFERENT AND THE MOL RATIO OF MO2 TO M''O''2 RANGES FROM 98:2 TO 2:8 AND WHERE M IS TIN AND M'' IS TITANIUM; (B) A RESISTANCE MODIFIER CONSISTING OF AT LEAST ONE METAL OXIDE SELECTED FROM THE GROUP CONSISTING OF ANTIMONY TRIOXIDE AND TANTALUM PENOXIDE PRESENT IN AN AMOUNT RANGING FROM ABOUT 0.1 MOL PERCENT TO ABOUT 5 MOL PERCENT WITH RESPECT TO THE MOLS OF MO2 M''O''2; SAID THERMISTOR HAVING A MEASURABLE RESISTIVITY OVER A WIDE RANGE OF TEMPERATURES UP TO AND INCLUDING 1000*C. AND BEING CHARACTERIZED BY HAVING A RESISTIVITY AT 600*C. OF NOT MORE THAN ABOUT 5X104 OHM-CM., A RESISTIVITY RATIO OF FROM ABOT 3X101 TO ABOUT 4X107 AND A PERCENT RESISTIVITY CHANGE PER DEGREE C. OF AT LEAST ABOUT 0.5.
Claim 2
Dependent Claim
170 words
A THERMISTOR SUITABLE FOR USE AS HIGH TEMPERATURE FLAME SENSOR WHICH CONSISTS OF A BODY AND A PAIR OF LEADS ATTACHED THERETO, SAID BODY CONSISTING ESSENTIALLY OF: (A) A SOLID SOLUTION OF OXIDES OF POLYVALENT METALS REPRESENTED BY THE FORMULA MO2M''O''2 WHRE M AND M ARE DIFFERENT AND THE MOL RATIO OF MO2 TO M''O''2 RANGES FROM 98:2 TO 2:8 AND WHERE M IS TIN AND M'' IS TITANIUM; (B) A RESISTANCE MODIFIER CONSISTING OF AT LEAST ONE METAL OXIDE SELECTED FROM THE GROUP CONSISTING OF ANTIMONY TRIOXIDE AND TANTALUM PENOXIDE PRESENT IN AN AMOUNT RANGING FROM ABOUT 0.1 MOL PERCENT TO ABOUT 5 MOL PERCENT WITH RESPECT TO THE MOLS OF MO2 M''O''2; SAID THERMISTOR HAVING A MEASURABLE RESISTIVITY OVER A WIDE RANGE OF TEMPERATURES UP TO AND INCLUDING 1000*C. AND BEING CHARACTERIZED BY HAVING A RESISTIVITY AT 600*C. OF NOT MORE THAN ABOUT 5X104 OHM-CM., A RESISTIVITY RATIO OF FROM ABOT 3X101 TO ABOUT 4X107 AND A PERCENT RESISTIVITY CHANGE PER DEGREE C. OF AT LEAST ABOUT 0.5.
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) | 1970-09-11 | 1971-03-13 | 1971-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-11 | 1975-03-13 | 1975-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-11 | 1979-03-13 | 1979-09-12 | $7700.00 | Window Closed / Lapsed |