US3170022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-optical photometer
Assignee: Eastman Kodak Co
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Filing: 1961-03-27
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Granted: 1965-02-16
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Expires: 1981-03-27
Abstract
No abstract record available.
Inventors
- 👤 Reesen Jorgen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:15
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40056; G; G01; G01J; G01J1/00; G01J1/42; G01J1/4209; G01J1/4223
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
A PHOTOMETER FOR INDICATING THE AVERAGE OPTICAL DENSITY OF A TRANSPARENCY TO LIGHT OF A PREDETERMINED COLOR, COMPRISING A FIRST SOURCE OF LIGHT OF SUCH COLOR FOR TRANSILLUMINATING THE TRANSPARENCY, A REFERENCE LIGHT SOURCE, SAID REFERENCE LIGHT SOURCE EMITTING LIGHT OF SUBSTANTIALLY CONSTANT INTENSITY, ELECTRO-OPTICAL MEANS RESPONSIVE TO LIGHT IMPINGING THEREON TO PRODUCE AN OUTPUT VOLTAGE HAVING A PREDETERMINED RELATIONSHIP TO THE INTENSITY OF THE LIGHT IMPINGING THEREON, LIGHT CONTROL MEANS FOR CYCLICALLY RENDERING SAID ELECTRO-OPTICAL MEANS ALTERNATELY RESPONSIVE TO DIFFUSE LIGHT FROM SAID FIRST SOURCE AS MODIFIED BY SAID TRANSILLUMINATED NEGATIVE AND FROM SAID REFERENCE SOURCE TO PRODUCE AN OUTPUT SIGNAL THEREFROM, MEANS FOR SHIFTING THE AVERAGE LEVEL OF THE OUTPUT SIGNAL FROM SAID ELECTRO-OPTICAL MEANS TO A PREDETERMINED REFERENCE VALUE, AS OUTPUT TERMINAL, AND SIGNAL GATING MEANS OPERATING IS TIMED SYNCHRONISM WITH SAID CONTROL MEANS FOR APPLYING SAID SHIFTED SIGNAL TO SAID OUTPUT TERMINAL ONLY DURING THOSE ALTERNATE PERIODS WHEN THE LIGHT IMPINGING ON SAID ELECTRO-OPTICAL MEANS IS DERVIED FROM SAID REFERENCE SOURCE.
Claim 2
Dependent Claim
165 words
A PHOTOMETER FOR INDICATING THE AVERAGE OPTICAL DENSITY OF A TRANSPARENCY TO LIGHT OF A PREDETERMINED COLOR, COMPRISING A FIRST SOURCE OF LIGHT OF SUCH COLOR FOR TRANSILLUMINATING THE TRANSPARENCY, A REFERENCE LIGHT SOURCE, SAID REFERENCE LIGHT SOURCE EMITTING LIGHT OF SUBSTANTIALLY CONSTANT INTENSITY, ELECTRO-OPTICAL MEANS RESPONSIVE TO LIGHT IMPINGING THEREON TO PRODUCE AN OUTPUT VOLTAGE HAVING A PREDETERMINED RELATIONSHIP TO THE INTENSITY OF THE LIGHT IMPINGING THEREON, LIGHT CONTROL MEANS FOR CYCLICALLY RENDERING SAID ELECTRO-OPTICAL MEANS ALTERNATELY RESPONSIVE TO DIFFUSE LIGHT FROM SAID FIRST SOURCE AS MODIFIED BY SAID TRANSILLUMINATED NEGATIVE AND FROM SAID REFERENCE SOURCE TO PRODUCE AN OUTPUT SIGNAL THEREFROM, MEANS FOR SHIFTING THE AVERAGE LEVEL OF THE OUTPUT SIGNAL FROM SAID ELECTRO-OPTICAL MEANS TO A PREDETERMINED REFERENCE VALUE, AS OUTPUT TERMINAL, AND SIGNAL GATING MEANS OPERATING IS TIMED SYNCHRONISM WITH SAID CONTROL MEANS FOR APPLYING SAID SHIFTED SIGNAL TO SAID OUTPUT TERMINAL ONLY DURING THOSE ALTERNATE PERIODS WHEN THE LIGHT IMPINGING ON SAID ELECTRO-OPTICAL MEANS IS DERVIED FROM SAID REFERENCE SOURCE.
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) | 1968-02-16 | 1968-08-17 | 1969-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-16 | 1972-08-17 | 1973-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-16 | 1976-08-17 | 1977-02-16 | $7700.00 | Window Closed / Lapsed |