US3365618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermally responsive protection circuit
Assignee: Texas Instruments Inc
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Filing: 1965-10-21
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Granted: 1968-01-23
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Expires: 1985-10-21
Abstract
No abstract record available.
Inventors
- 👤 Robert E Obenhaus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:54
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/02; H01C7/022; G; G01; G01K; G01K7/00; G01K7/42; H01C7/04; H02; H02H; H02H5/00; H02H5/04; H02H5/042
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
204 words
A THERMAL SENSOR FOR CONTROLLING AN OVERLOAD PROTECTOR WHICH DEENERGIZES ELECTRICAL APPARATUS IN RESPONSE TO CHANGES IN SENSOR RESISTANCE, SAID SENSOR COMPRISING: FIRST AND SECOND THERMISTOR ELEMENTS EACH HAVING A RELATIVELY LOW THERMAL INERTIA, SAID FIRST AND SECOND ELEMENTS BEING INTERCONNECTED WITH SAID PROTECTOR SO THAT UNOPPOSED CHANGES IN THE RESISTANCE OF EITHER ELEMENT WILL ACTUATE SAID PROTECTOR, SAID FIRST THERMISTOR ELEMENT HAVING A TEMPERATURE COEFFICIENT OF RESISTIVITY OF A FIRST TYPE; AND A THIRD THERMISTOR ELEMENT HAVING A TEMPERATURE COEFFICIENT OF RESISTIVITY OPPOSITE IN TYPE TO SAID FIRST THERMISTOR ELEMENT AND HAVING A RELATIVELY LARGE THERMAL INERTIA, SAID THIRD THERMISTOR ELEMENT BEING INTERCONNECTED WITH SAID FIRST ELEMENT SO THAT CHANGES IN THE RESISTANCE OF SAID THIRD ELEMENT OPPOSE THE EFFECTS OF CHANGES OF RESISTANCE IN SAID FIRST ELEMENT WHEREBY ACTUATION OF SAID PROTECTOR BY SLOW RATES OF RISE OF TEMPERATURE IS EFFECTED BY CHANGES IN THE RESISTANCE OF SAID SECOND ELEMENT SUBSTANTIALLY INDEPENDENTLY OF THE RESISTANCE OF SAID FIRST AND THIRD ELEMENTS BUT ACTUATION OF SAID PROTECTOR IN RESPONSE TO RELATIVELY RAPID RATES OF RISE OF TEMPERATURE IS EFFECTED SUBSTANTIALLY BY THE CHANGE OF RESISTANCE OF SAID FIRST ELEMENT THEREBY PROVIDING AN ACCELERATED DEENERGIZATION OF SAID ELECTRICAL APPARATUS UPON RAPID RISES IN TEMPERATURE.
Claim 2
Dependent Claim
204 words
A THERMAL SENSOR FOR CONTROLLING AN OVERLOAD PROTECTOR WHICH DEENERGIZES ELECTRICAL APPARATUS IN RESPONSE TO CHANGES IN SENSOR RESISTANCE, SAID SENSOR COMPRISING: FIRST AND SECOND THERMISTOR ELEMENTS EACH HAVING A RELATIVELY LOW THERMAL INERTIA, SAID FIRST AND SECOND ELEMENTS BEING INTERCONNECTED WITH SAID PROTECTOR SO THAT UNOPPOSED CHANGES IN THE RESISTANCE OF EITHER ELEMENT WILL ACTUATE SAID PROTECTOR, SAID FIRST THERMISTOR ELEMENT HAVING A TEMPERATURE COEFFICIENT OF RESISTIVITY OF A FIRST TYPE; AND A THIRD THERMISTOR ELEMENT HAVING A TEMPERATURE COEFFICIENT OF RESISTIVITY OPPOSITE IN TYPE TO SAID FIRST THERMISTOR ELEMENT AND HAVING A RELATIVELY LARGE THERMAL INERTIA, SAID THIRD THERMISTOR ELEMENT BEING INTERCONNECTED WITH SAID FIRST ELEMENT SO THAT CHANGES IN THE RESISTANCE OF SAID THIRD ELEMENT OPPOSE THE EFFECTS OF CHANGES OF RESISTANCE IN SAID FIRST ELEMENT WHEREBY ACTUATION OF SAID PROTECTOR BY SLOW RATES OF RISE OF TEMPERATURE IS EFFECTED BY CHANGES IN THE RESISTANCE OF SAID SECOND ELEMENT SUBSTANTIALLY INDEPENDENTLY OF THE RESISTANCE OF SAID FIRST AND THIRD ELEMENTS BUT ACTUATION OF SAID PROTECTOR IN RESPONSE TO RELATIVELY RAPID RATES OF RISE OF TEMPERATURE IS EFFECTED SUBSTANTIALLY BY THE CHANGE OF RESISTANCE OF SAID FIRST ELEMENT THEREBY PROVIDING AN ACCELERATED DEENERGIZATION OF SAID ELECTRICAL APPARATUS UPON RAPID RISES IN TEMPERATURE.
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) | 1971-01-22 | 1971-07-24 | 1972-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-22 | 1975-07-24 | 1976-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-22 | 1979-07-24 | 1980-01-23 | $7700.00 | Window Closed / Lapsed |