US3421008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoelectric control device for street lights
Assignee: Tork Time Controls Inc
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Filing: 1966-07-13
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Granted: 1969-01-07
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Expires: 1986-07-13
Abstract
No abstract record available.
Inventors
- 👤 Mark B Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:43
CPC Classifications
H; H05; H05B; H05B47/00; H05B47/10; H05B47/105; H05B47/11; Y; Y02; Y02B; Y02B20/00; Y02B20/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
IN A PHOTOELECTRICALLY CONTROLLED SYSTEM FOR STREET LIGHTS AND OTHER LOADS INCLUDING A LOAD SWITCHING MEANS FOR OPENING AND CLOSING A CIRCUIT FROM A CURRENT SUPPLY LINE TO A LOAD TERMINAL IN RESPONSE TO CHANGES IN AMBIENT LIGHT CONDITIONS, IN WHICH SAID SWITCHING MEANS INCLUDES AN ACTUATOR LOCATED IN A TRIGGERING CIRCUIT CONNECTED INTO AND RESPONSIVE TO A LIGHT SENSOR, THE IMPROVEMENT COMPRISINGG A DIODE CONNECTED BETWEEN THE CURRENT SUPPLY LINE AND THE ACTUATOR, A CONTROLLED RECTIFIER CONNECTED ANODETO-CATHODE FROM SAID ACTUATOR INTO A NEUTRAL LINE, AND A SOLID STATE UNIJUNCTION TRANSISTOR CONNECTED THROUGH A RESISTANCE TO THE OUTPUT OF SAID DIODE AND INTO THE GATE OF SAID RECTIFIER.
Claim 2
Dependent Claim
109 words
IN A PHOTOELECTRICALLY CONTROLLED SYSTEM FOR STREET LIGHTS AND OTHER LOADS INCLUDING A LOAD SWITCHING MEANS FOR OPENING AND CLOSING A CIRCUIT FROM A CURRENT SUPPLY LINE TO A LOAD TERMINAL IN RESPONSE TO CHANGES IN AMBIENT LIGHT CONDITIONS, IN WHICH SAID SWITCHING MEANS INCLUDES AN ACTUATOR LOCATED IN A TRIGGERING CIRCUIT CONNECTED INTO AND RESPONSIVE TO A LIGHT SENSOR, THE IMPROVEMENT COMPRISINGG A DIODE CONNECTED BETWEEN THE CURRENT SUPPLY LINE AND THE ACTUATOR, A CONTROLLED RECTIFIER CONNECTED ANODETO-CATHODE FROM SAID ACTUATOR INTO A NEUTRAL LINE, AND A SOLID STATE UNIJUNCTION TRANSISTOR CONNECTED THROUGH A RESISTANCE TO THE OUTPUT OF SAID DIODE AND INTO THE GATE OF SAID RECTIFIER.
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) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |