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US2720573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermistor disks
Assignee: Individual
•
Filing: 1951-06-27
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Granted: 1955-10-11
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Expires: 1971-06-27
Abstract
No abstract record available.
Inventors
- 👤 Dick O R Lundqvist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:11
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/04; H01C7/042; H01C7/043
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
THE METHOD OF PRODUCING THERMISTORS COMPRISING THE STEPS OF INTERPOSING A THIN LAYER OF AN ELECTRICALLY SEMI-CONDUCTING MASS COMPOSED OF A MIXTURE OF AT LEAST THE OXIDES OF TWO HEAVY METALS BETWEEN TWO SOLID DISCSHAPED THIN ELECTRODES FORMED OF AN ALLOY OF AT LEAST IRON AND NICKEL, HEATING THE UNIT AS A WHOLE TO AT LEAST A TEMPERATURE TO SINTER THE MASS, CONTINUING THE HEATING UNTIL ADHESION COMMENCES BETWEEN THE MASS AND THE ELECTRODES AND COOLING THE UNIT TO COMPLETE THE ADHESION.
Claim 2
Independent Claim
82 words
THE METHOD OF PRODUCING THERMISTORS COMPRISING THE STEPS OF INTERPOSING A THIN LAYER OF AN ELECTRICALLY SEMI-CONDUCTING MASS COMPOSED OF A MIXTURE OF AT LEAST THE OXIDES OF TWO HEAVY METALS BETWEEN TWO SOLID DISCSHAPED THIN ELECTRODES FORMED OF AN ALLOY OF AT LEAST IRON AND NICKEL, HEATING THE UNIT AS A WHOLE TO AT LEAST A TEMPERATURE TO SINTER THE MASS, CONTINUING THE HEATING UNTIL ADHESION COMMENCES BETWEEN THE MASS AND THE ELECTRODES AND COOLING THE UNIT TO COMPLETE THE ADHESION.
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) | 1958-10-10 | 1959-04-11 | 1959-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-10 | 1963-04-11 | 1963-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-10 | 1967-04-11 | 1967-10-11 | $7700.00 | Window Closed / Lapsed |