US3146375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lamp changer mechanism and control circuit therefor responsive to both light emission and filament continuity
Assignee: US Filter Wallace and Tiernan Inc
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Filing: 1961-02-24
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Granted: 1964-08-25
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Expires: 1981-02-24
Abstract
No abstract record available.
Inventors
- 👤 George A Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:59
CPC Classifications
H; H05; H05B; H05B39/00; H05B39/10; H05B39/105; F; F21; F21V; F21V19/00; F21V19/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
A CONTROL SYSTEM FOR A LAMP CHANGER COMPRISING A SOURCE OF UNIDIRECTIONAL ELECTRICAL ENERGY, INCANDESCENT LAMP MEANS INCLUDING FILAMENT MEANS ENERGIZABLE FROM SAID SOURCE, A CONTROL CIRCUIT, MEANS RESPONSIVE TO A PRESELECTED VOLTAGE LEVEL IN SAID CONTROL CIRCUIT FOR INHIBITING A CONTROL EFFECT, FIRST MEANS FOR ESTABLISHING SAID VOLTAGE LEVEL DURING PERIODS WHEN THE LAMP IS ENERGIZED, AND SECOND MEANS FOR ESTABLISHING SAID VOLTAGE LEVEL DURING PERIODS WHEN THE LAMP IS NOT ENERGIZED, SAID FIRST MEANS BEING RESPONSIVE TO LIGHT EMISSION FROM SAID LAMP AND
Claim 2
Dependent Claim
85 words
A CONTROL SYSTEM FOR A LAMP CHANGER COMPRISING A SOURCE OF UNIDIRECTIONAL ELECTRICAL ENERGY, INCANDESCENT LAMP MEANS INCLUDING FILAMENT MEANS ENERGIZABLE FROM SAID SOURCE, A CONTROL CIRCUIT, MEANS RESPONSIVE TO A PRESELECTED VOLTAGE LEVEL IN SAID CONTROL CIRCUIT FOR INHIBITING A CONTROL EFFECT, FIRST MEANS FOR ESTABLISHING SAID VOLTAGE LEVEL DURING PERIODS WHEN THE LAMP IS ENERGIZED, AND SECOND MEANS FOR ESTABLISHING SAID VOLTAGE LEVEL DURING PERIODS WHEN THE LAMP IS NOT ENERGIZED, SAID FIRST MEANS BEING RESPONSIVE TO LIGHT EMISSION FROM SAID LAMP AND
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) | 1967-08-25 | 1968-02-24 | 1968-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-25 | 1972-02-24 | 1972-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-25 | 1976-02-24 | 1976-08-25 | $7700.00 | Window Closed / Lapsed |