US2731564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Barium titanate temperature control
Assignee: Individual
•
Filing: 1951-11-05
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Granted: 1956-01-17
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Expires: 1971-11-05
Abstract
No abstract record available.
Inventors
- 👤 Edelstein Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:28
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/30; H03B5/32; H03B5/34; G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/2033; G05D23/2036
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
80 words
AN OVEN TEMPERATURE CONTROL APPARATUS COMPRISING, AN OVEN INCLUDING THEREIN A HEATING ELEMENT, A PIEZO-ELECTRIC CRYSTAL AND A TEMPERATURE SENSITIVE CONDENSER HAVING A NEGATIVE TEMPERATURE COEFFICIENT OF CAPACITY, A POWER AMPLIFIER HAVING AN OUTPUT CIRCUIT CONNECTED TO SAID HEATER TO SUPPLY THE HEATING ENERGY THEREFOR, AN OSCILLATOR AND A CONNECTION FROM SAID PIEZO-ELECTRIC CRYSTAL THERETO TO DETERMINE THE STABLE FREQUENCY THEREOF, A TUNED FREQUENCY DISCRIMINATOR COUPLED TO THE OUTPUT OF SAID OSCILLATOR, A CONNECTION FROM SAID TEMPERATURE SENSTIVE CONDENSER TO
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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) | 1959-01-16 | 1959-07-18 | 1960-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-16 | 1963-07-18 | 1964-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-16 | 1967-07-18 | 1968-01-17 | $7700.00 | Window Closed / Lapsed |