Patent US4275951A successfully refreshed from Google Patents.
Patent US20030004567A1 successfully refreshed from Google Patents.
US3181003A
Expired / Lapsed
US
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Solid state relay utilizing variable photoresistors and isolating diodes
Assignee: CELESTRONICS Inc
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Filing: 1961-05-22
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Granted: 1965-04-27
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Expires: 1981-05-22
Abstract
No abstract record available.
Inventors
- 👤 Charles R Sauber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:35
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/78; H03K17/795
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
IN A SWITCHING CIRCUIT, THE COMBINATION OF: A FIRST TERMINAL SET INCLUDING TWO TRANSISTOR DEVICES EACH HAVING A BASE, AN EMITTER ELEMENT AND A COLLECTOR ELEMENT, TWO DIODES, CIRCUIT MEANS FOR CONNECTING SAID ELEMENTS AND DIODES IN A SERIES LOOP ALTERNATE DIODE AND TRANSISTOR DEVICE WITH THE DIODES POLED OPPOSITE TO THE TRANSISTOR DEVICES, AND A PHOTORESISTOR CONNECTED ACROSS THE BASE AND EMITTER ELEMENT OF EACH TRANSISTOR DEVICE RESPECTIVELY; A SECOND TERMINAL SET INCLUDING TWO TRANSISTOR DEVICES EACH HAVING A BASE, AN EMITTER ELEMENT AND A COLLECTOR ELEMENT, TWO DIODES, CIRCUIT MEANS FOR CONNECTING SAID ELEMENTS AND DIODES IN A SERIES LOOP ALTERNATING DIODE AND TRANSISTOR DEVICE WITH THE DIODES POLED OPPOSITE TO THE TRANSISTOR DEVICES, AND A PHOTORESISTOR CONNECTED ACROSS THE BASE AND EMITTER ELEMENT OF EACH TRANSISTOR DEVICE RESPECTIVELY; A FIRST RADIATION SOURCE FOR ILLUMINATING THE PHOTORESISTORS OF SAID FIRST TERMINAL SET; A SECOND RADIATION SOURCE FOR ILLUMINATING THE PHOTORESISTORS OF SAID SECOND TERMINAL SET; AND MEANS FOR SELECTIVELY ENERGIZING SAID SOURCES.
Claim 2
Dependent Claim
164 words
IN A SWITCHING CIRCUIT, THE COMBINATION OF: A FIRST TERMINAL SET INCLUDING TWO TRANSISTOR DEVICES EACH HAVING A BASE, AN EMITTER ELEMENT AND A COLLECTOR ELEMENT, TWO DIODES, CIRCUIT MEANS FOR CONNECTING SAID ELEMENTS AND DIODES IN A SERIES LOOP ALTERNATE DIODE AND TRANSISTOR DEVICE WITH THE DIODES POLED OPPOSITE TO THE TRANSISTOR DEVICES, AND A PHOTORESISTOR CONNECTED ACROSS THE BASE AND EMITTER ELEMENT OF EACH TRANSISTOR DEVICE RESPECTIVELY; A SECOND TERMINAL SET INCLUDING TWO TRANSISTOR DEVICES EACH HAVING A BASE, AN EMITTER ELEMENT AND A COLLECTOR ELEMENT, TWO DIODES, CIRCUIT MEANS FOR CONNECTING SAID ELEMENTS AND DIODES IN A SERIES LOOP ALTERNATING DIODE AND TRANSISTOR DEVICE WITH THE DIODES POLED OPPOSITE TO THE TRANSISTOR DEVICES, AND A PHOTORESISTOR CONNECTED ACROSS THE BASE AND EMITTER ELEMENT OF EACH TRANSISTOR DEVICE RESPECTIVELY; A FIRST RADIATION SOURCE FOR ILLUMINATING THE PHOTORESISTORS OF SAID FIRST TERMINAL SET; A SECOND RADIATION SOURCE FOR ILLUMINATING THE PHOTORESISTORS OF SAID SECOND TERMINAL SET; AND MEANS FOR SELECTIVELY ENERGIZING SAID SOURCES.
References Cited (Backward Citations)
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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) | 1968-04-26 | 1968-10-26 | 1969-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-26 | 1972-10-26 | 1973-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-26 | 1976-10-26 | 1977-04-27 | $7700.00 | Window Closed / Lapsed |