US3598762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vanadium oxide semiconductors and method of manufacturing same
Assignee: Hitachi Ltd
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Filing: 1967-09-21
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Granted: 1971-08-10
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Expires: 1987-09-21
Abstract
Abstract A THERMISTOR HAVING AN ABRUPT CHANGE IN A NEGATIVE TEMPERATURE COEFFICIENT OF ELECTRICAL RESISTANCE IN A SPECIFIC TEMPERATURE RANGE FROM 65 TO 70*C., WHICH COMPRISES A SINTERED BODY COMPOSED OF A SEMICONDUCTIVE OXIDE SUBSTANCE AND A PLURALITY OF CRYSTALLINE PARTICLES OF V204 SUSPENDED IN AND ENCLOSED BY SAID OXIDE SUBSTANCE. THIS SPECIFICATION ALSO DISCLOSES METHODS FOR PRODUCING THEREOF WHICH COMPRISES THE STEPS OF REDUCING A MIXTURE OF V2O5 AND OTHER OXIDE AT ABOUT 400*C. AND SINTERING THE REDUCED MIXTURE AT 1000-1300*C.
Inventors
- 👤 Hisao Futaki
- 👤 Takeshi Shimoda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:23
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/06; H01B1/08; H01C; H01C7/00; H01C7/04; H01C7/042; H01C7/043; H01C7/047
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |