US3213377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light modulation system using phase controlled synchronous motors
Assignee: Ilford Imaging UK Ltd
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Filing: 1963-04-26
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Granted: 1965-10-19
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Expires: 1983-04-26
Abstract
No abstract record available.
Inventors
- 👤 Neale Denis Manktelow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:47
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/36; H05B41/38; H05B41/39; H05B41/392; H05B41/3921; H05B41/3924; G; G03; G03B; G03B27/00; G03B27/72
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
APPARATUS FOR USE IN CONTROLLING THE MEAN LIGHT OUTPUT OF AN ELECTRIC DISCHARGE LAMP OPERATING ON AN ALTERNATING CURRENT POWER SUPPLY WHICH COMPRISES AN ELECTRIC DISCHARGE LAMP AND MEANS FOR CONNECTING SAME TO AN ALTERNATING CURRENT POWER SUPPLY, A TAPPED IMPEDANCE CONNECTED ACROSS SAID ALTERNATING CURRENT POWER SUPPLY, A LOAD IMPEDANCE AND A CONTROLLED VARIABLE REACTANCE CONNECTED IN SERIES ACROSS SAID POWER SUPPLY, A SYNCHRONOUS MOTOR CONNECTED BETWEEN A TAP ON SAID TAPPED IMPEDANCE AND THE JUNCTION OF SAID LOAD IMPEDANCE AND SAID CONTROLLED VARIABLE REACTANCE, AND SECTORS ADAPTED TO BE ROTATED BY SAID SYNCHRONOUS MOTOR TO INTERCEPT LIGHT FROM SAID DISCHARGE LAMP AT TWICE THE FREQUENCY OF THE SAID
Claim 2
Dependent Claim
110 words
APPARATUS FOR USE IN CONTROLLING THE MEAN LIGHT OUTPUT OF AN ELECTRIC DISCHARGE LAMP OPERATING ON AN ALTERNATING CURRENT POWER SUPPLY WHICH COMPRISES AN ELECTRIC DISCHARGE LAMP AND MEANS FOR CONNECTING SAME TO AN ALTERNATING CURRENT POWER SUPPLY, A TAPPED IMPEDANCE CONNECTED ACROSS SAID ALTERNATING CURRENT POWER SUPPLY, A LOAD IMPEDANCE AND A CONTROLLED VARIABLE REACTANCE CONNECTED IN SERIES ACROSS SAID POWER SUPPLY, A SYNCHRONOUS MOTOR CONNECTED BETWEEN A TAP ON SAID TAPPED IMPEDANCE AND THE JUNCTION OF SAID LOAD IMPEDANCE AND SAID CONTROLLED VARIABLE REACTANCE, AND SECTORS ADAPTED TO BE ROTATED BY SAID SYNCHRONOUS MOTOR TO INTERCEPT LIGHT FROM SAID DISCHARGE LAMP AT TWICE THE FREQUENCY OF THE SAID
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) | 1968-10-18 | 1969-04-19 | 1969-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-18 | 1973-04-19 | 1973-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-18 | 1977-04-19 | 1977-10-19 | $7700.00 | Window Closed / Lapsed |