US3204418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multivibrator-type control circuit for thermoelectric elements
Assignee: Individual
•
Filing: 1964-11-25
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Granted: 1965-09-07
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Expires: 1984-11-25
Abstract
No abstract record available.
Inventors
- 👤 Donald A Mathews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:40
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/24; G05D23/1919
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
A MULTIVIBRATOR-TYPE THERMOELECTRIC ELEMENT CONTROL CIRCUIT COMPRISING, A THERMOELECTRIC ELEMENT, A MEMBER ARRANGED TO BE HEATED AND COOLED BY SAID THERMOELECTRIC ELEMENT, A RESISTANCE-TYPE SENSOR DISPOSED ON SAID MEMBER, FIRST AND SECOND DIRECT CURRENT SOURCES FOR SUPPLYING SAID THERMOELECTRIC ELEMENT WITH CURRENT IN THE HEATING AND COOLING DIRECTIONS, RESPECTIVELY, FREE-RUNNING MULTIVIBRATOR MEANS FOR CONNECTING SAID FIRST SOURCE TO SAID THERMOELECTRIC ELEMENT FOR FIRST PERIODS OF TIME AND ALTERNATELY CONNECTING SAID SECOND SOURCE TO SAID THERMOELECTRIC ELEMENT FOR SECOND PERIODS OF TIME, ONE OF SAID PERIODS BEING CONSTANT, THE OTHER OF SAID PERIODS BEING PROPORTIONAL TO THE RESISTANCE OF SAID SENSOR.
Claim 2
Dependent Claim
100 words
A MULTIVIBRATOR-TYPE THERMOELECTRIC ELEMENT CONTROL CIRCUIT COMPRISING, A THERMOELECTRIC ELEMENT, A MEMBER ARRANGED TO BE HEATED AND COOLED BY SAID THERMOELECTRIC ELEMENT, A RESISTANCE-TYPE SENSOR DISPOSED ON SAID MEMBER, FIRST AND SECOND DIRECT CURRENT SOURCES FOR SUPPLYING SAID THERMOELECTRIC ELEMENT WITH CURRENT IN THE HEATING AND COOLING DIRECTIONS, RESPECTIVELY, FREE-RUNNING MULTIVIBRATOR MEANS FOR CONNECTING SAID FIRST SOURCE TO SAID THERMOELECTRIC ELEMENT FOR FIRST PERIODS OF TIME AND ALTERNATELY CONNECTING SAID SECOND SOURCE TO SAID THERMOELECTRIC ELEMENT FOR SECOND PERIODS OF TIME, ONE OF SAID PERIODS BEING CONSTANT, THE OTHER OF SAID PERIODS BEING PROPORTIONAL TO THE RESISTANCE OF SAID SENSOR.
References Cited (Backward Citations)
US2975638A
Cited
US2984729A
Cited
US2979950A
Cited
US3031855A
Cited
US3166928A
Cited
US3112648A
Cited
US3111008A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-06 | 1969-03-08 | 1969-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-06 | 1973-03-08 | 1973-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-06 | 1977-03-08 | 1977-09-07 | $7700.00 | Window Closed / Lapsed |