Patent US3200327A successfully refreshed from Google Patents.
US3200327A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Theater lighting control apparatus
Assignee: ELECTRONIC DIMMER CORP
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Filing: 1961-02-17
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Granted: 1965-08-10
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Expires: 1981-02-17
Abstract
No abstract record available.
Inventors
- 👤 Joseph W Fleming
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:59
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/40; G05F1/44; G05F1/45; G05F1/455; H; H05; H05B; H05B39/00; H05B39/04; H05B39/08; H05B39/083; H05B47/00; H05B47/10; Y; Y10; Y10S; Y10S315/00; Y10S315/03
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
308 words
A CONTROLLED RECTIFIER SYSTEM FOR VARIABLY CONTROLLING THE APPLICATION OF AN ALTERNATING VOLTAGE TO A LOAD BY A VARIABLE D.-C. CONTROL VOLTAGE COMPRISING POWER INPUT TERMINALS PROVIDED TO RECEIVE A.-C. VOLTAGE FROM A SUPPLY SOURCE, POWER OUTPUTS TERMINALS PROVIDED TO DELIVER A.-C. VOLTAGE TO A LOAD, A SOLID STATE CONTROLLED RECTIFIER HAVING A CATHODE, AN ANODE AND A GATE CONTROL ECLECTRODE, A MAGNETIC AMPLIFIER INCLUDING A SATURABLE MAGNETIC CORE HAVING AT LEAST A GATE WINDING CONNECTED TO THE INPUT AND OUTPUT TERMINALS AND HAVING A CONTROL WINDING, CIRCUIT MEANS CONNECTED IN SERIES WITH SAID GATE WINDING ADAPTED TO APPLY AN A.-C. CONTROL VOLTAGE BETWEEN THE CHAHODE AND THE CONTROL-ELECTRODE OF SAID CONTROLLED RECTIFIER, MEANS FOR CONNECTING THE ANODE AND CATHODE TERMINALS OF SAID RECTIFIER BETWEEN AN A.-C. INPUT TERMINAL AND AN A.-C. OUTPUT TERMINAL, A D.-C. VOLTAGE SUPPLY INCLUDING MANUALLY OPERABLE MEANS FOR VARYING THE OUTPUT VOLTAGE OF SAID SUPPLY TO PRODUCE A D.-C. CONTROL VOLTAGE, CURRENT CONTROL MEANS CONNECTING THE D.-C. CONTROL VOLTAGE OF SAID SUPPLY TO SAID CONTROL WINDING, FIRST LOAD-CURRENT-FEEDBACK CONTROL MEANS CONNECTED TO SAID CURRENT CONTROL MEANS OPERABLE WHEN SAID LOAD CURRENT REACHES A PREDETERMINED MAXIMUM VALUE TO REDUCE THE D.-C. CURRENT FLOW THROUGH SAID CURRENT CONTROL MEANS TO SAID CONTROL WINDING AND THEREBY LIMIT THE CURRENT FLOW THROUGH SAID CONTROLLED RECTIFIER AND LOAD TO SAID PREDETERMINED MAXIMUM VALUR, SECOND LOAD-CURRENT FEEDBACK CONTROL MEANS CONNECTED TO SAID CURRENT CONTROL MEANS INCLUDING CURRENT LIMITING MEANS PROVIDED TO RESTRICT THE D.-C. CURRENT FLOW THROUGH SAID CURRENT CONTROL MEANS TO SAID CONTROL WINDING TO A PREDETERMINED MAXIMUM VALUE WHEN THE LOAD CURRENT IS SMALL, SAID LIMITING MEANS BEING RESPONSIVE TO LOAD CURRENT FEEDBACK AND BEING DISABLED WHEN THE LOAD CURRENT EXCEEDS A PREDETERMINED MAXIMUM VALUE THEREBY PREMITTING THE LOAD CURRENT TO BE CONTROLLED BETWEEN PREDETERMINED MAXIMUM AND MAXIMUM VALUES BY THE ADJUSTMENT OF SAID MANUALLY OPERABLE MEANS.
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) | 1968-08-09 | 1969-02-08 | 1969-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-09 | 1973-02-08 | 1973-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-09 | 1977-02-08 | 1977-08-10 | $7700.00 | Window Closed / Lapsed |