Patent US3136877A successfully refreshed from Google Patents.
US3136877A
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Electronic thermostatic system
Assignee: Bulova Watch Co Inc
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Filing: 1962-06-25
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Granted: 1964-06-09
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Expires: 1982-06-25
Abstract
No abstract record available.
Inventors
- 👤 Heller Oscar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:27
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/24; G05D23/1906; G05D23/1909
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
AN ELECTRONIC THERMOSTATIC SYSTEM FOR AN ALTERNATINGCURRENT SUPPLY FEEDING A HEATER ELEMENT DISPOSED WITHIN AN OVEN, COMPRISING A SILICON-CONTROLLED RECTIFIER SWITCH CONNECTED IN SERIES WITH SAID HEATER ELEMENT AND SAID SUPPLY TO PASS CURRENT THERETO DURING POSITIVE HALF CYCLES OF SAID SUPPLY, SAID SWITCH HAVING A CONTROL ELECTRODE TO TRIGGER SAID SWITCH, A BRIDGE CIRCUIT COMPOSED OF FOUR RESISTOR ARMS, ONE RESISTOR BEING DISPOSED IN SAID OVEN AND BEING TEMPERATURE-SENSITIVE, THE OTHER RESISTORS HAVING CONSTANT VALUES, MEANS TO APPLY SAID ALTERNATING CURRENT FROM SAID SUPPLY ACROSS THE INPUT DIAGONALS OF SAID BRIDGE, A DIFFERENTIAL AMPLIFIER CONSTITUTED BY A PAIR OF TRANSISTORS EACH HAVING A BASE, AN EMITTER AND A COLLECTOR ELECTRODE,
Claim 2
Dependent Claim
111 words
AN ELECTRONIC THERMOSTATIC SYSTEM FOR AN ALTERNATINGCURRENT SUPPLY FEEDING A HEATER ELEMENT DISPOSED WITHIN AN OVEN, COMPRISING A SILICON-CONTROLLED RECTIFIER SWITCH CONNECTED IN SERIES WITH SAID HEATER ELEMENT AND SAID SUPPLY TO PASS CURRENT THERETO DURING POSITIVE HALF CYCLES OF SAID SUPPLY, SAID SWITCH HAVING A CONTROL ELECTRODE TO TRIGGER SAID SWITCH, A BRIDGE CIRCUIT COMPOSED OF FOUR RESISTOR ARMS, ONE RESISTOR BEING DISPOSED IN SAID OVEN AND BEING TEMPERATURE-SENSITIVE, THE OTHER RESISTORS HAVING CONSTANT VALUES, MEANS TO APPLY SAID ALTERNATING CURRENT FROM SAID SUPPLY ACROSS THE INPUT DIAGONALS OF SAID BRIDGE, A DIFFERENTIAL AMPLIFIER CONSTITUTED BY A PAIR OF TRANSISTORS EACH HAVING A BASE, AN EMITTER AND A COLLECTOR ELECTRODE,
References Cited (Backward Citations)
US3042782A
Cited
US3109910A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-09 | 1967-12-09 | 1968-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-09 | 1971-12-09 | 1972-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-09 | 1975-12-09 | 1976-06-09 | $7700.00 | Window Closed / Lapsed |