Patent US2511195A successfully refreshed from Google Patents.
US3215843A
Expired / Lapsed
US
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Photosensitive light source intensity control system
Assignee: SPECIAL INSTR LAB Inc
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Filing: 1961-06-02
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Granted: 1965-11-02
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Expires: 1981-06-02
Abstract
No abstract record available.
Inventors
- 👤 Hugh G Neil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:21
CPC Classifications
H; H05; H05B; H05B39/00; H05B39/04; H05B39/08; H05B39/081
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A SYSTEM FOR REGULATING THE INTENSITY OF A LIGHT SOURCE AT A PRESELECTED VALUE COMPRISING A POWER SUPPLY FOR THE LIGHT SOURCE, A PHOTOTUBE, MEANS FOR MOUNTING THE PHOTOTUBE EXPOSED TO THE LIGHT SOURCE, MEANS FOR SUPPLYING A DIRECT CURRENT POTENTIAL TO THE PHOTOTUBE, A CAPACITIVE CHOPPER FOR CONVERTING THE DIRECT CURRENT OUTPUT OF THE PHOTOTUBE TO AN ALTERNATING CURRENT, MEANS FOR DETECTING THE PHASE OF THE CURRENT FROM THE CHOPPER, AND MEANS RESPONSIVE TO THE PHASE OF THE OUTPUT OF THE CHOPPER FOR APPLYING A CORRECTIVE SIGNAL TO THE POWER SUPPLY TO REGULATE THE INTENSITY OF LIGHT FROM THE LIGHT SOURCE.
Claim 2
Independent Claim
102 words
A SYSTEM FOR REGULATING THE INTENSITY OF A LIGHT SOURCE AT A PRESELECTED VALUE COMPRISING A POWER SUPPLY FOR THE LIGHT SOURCE, A PHOTOTUBE, MEANS FOR MOUNTING THE PHOTOTUBE EXPOSED TO THE LIGHT SOURCE, MEANS FOR SUPPLYING A DIRECT CURRENT POTENTIAL TO THE PHOTOTUBE, A CAPACITIVE CHOPPER FOR CONVERTING THE DIRECT CURRENT OUTPUT OF THE PHOTOTUBE TO AN ALTERNATING CURRENT, MEANS FOR DETECTING THE PHASE OF THE CURRENT FROM THE CHOPPER, AND MEANS RESPONSIVE TO THE PHASE OF THE OUTPUT OF THE CHOPPER FOR APPLYING A CORRECTIVE SIGNAL TO THE POWER SUPPLY TO REGULATE THE INTENSITY OF LIGHT FROM THE LIGHT SOURCE.
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) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |