Patent US2981699A successfully refreshed from Google Patents.
US2981699A
Expired / Lapsed
US
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Positive temperature coefficient thermistor materials
Assignee: Westinghouse Electric Corp
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Filing: 1959-12-28
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Granted: 1961-04-25
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Expires: 1979-12-28
Abstract
No abstract record available.
Inventors
- 👤 Ichikawa Yoshio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:46
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4682; C04B35/4684; H; H01; H01C; H01C7/00; H01C7/02; H01C7/022; H01C7/023; H01C7/025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A THERMISTOR BODY COMPRISING THE SINTERED COMPOSITION MXBA(1-X)ZRYTI(1-Y)O3 WITH FROM 0.01% TO 1% BY WEIGHT OF LEAD OXIDE INTIMATELY ADMIXED THEREIN, WHERE M REPRESENTS AT LEAST ONE RARE EARTH METAL FROM THE GROUP CONSISTING OF YTTRIUM AND CERIUM, X HAS A VALUE OF FROM 0.003 TO 0.03, AND Y HAS A VALUE OF FROM 0.01 TO 0.25.
Claim 2
Dependent Claim
57 words
A THERMISTOR BODY COMPRISING THE SINTERED COMPOSITION MXBA(1-X)ZRYTI(1-Y)O3 WITH FROM 0.01% TO 1% BY WEIGHT OF LEAD OXIDE INTIMATELY ADMIXED THEREIN, WHERE M REPRESENTS AT LEAST ONE RARE EARTH METAL FROM THE GROUP CONSISTING OF YTTRIUM AND CERIUM, X HAS A VALUE OF FROM 0.003 TO 0.03, AND Y HAS A VALUE OF FROM 0.01 TO 0.25.
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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) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |