US3388652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic processing control
Assignee: Technical Operations Inc
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Filing: 1965-05-27
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Granted: 1968-06-18
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Expires: 1985-05-27
Abstract
No abstract record available.
Inventors
- 👤 Jr George B Parrent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:25
CPC Classifications
G; G03; G03D; G03D13/00; G03D13/007
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
A METHOD OF CONTROLLING PHOTOGRAPHIC DEVELOPMENT BY EXAMINING THE BUILDUP OF THE SILVER IMAGE COMPRISING: (A) IMMERSING A FRAME OF PHOTOGRAPHIC MATERIAL BEARING A LATENT IMAGE IN A DEVELOPER; (B) COHERENTLY ILLUMINATING SAID FRAME WITH A BEAM OF COLLIMATED NONACTINIC LIGHT; (C) INTERCEPTING LIGHT PASSING FROM SAID FRAME AND DIVIDING IT INTO A FIRST BEAM AND A SECOND BEAM; (D) DETECTING THE INTEGRATED INTENSITY OF THE LIGHT IN SAID FIRST BEAM; (E) PASSING THE LIGHT IN SAID SECOND BEAM THROUGH A TRANSFORMING LENS TO PRODUCE A FOURIER TRANSFORM OF THE LIGHT FROM SAID FRAME IN A TRANSFORM PLANE; (F) DETECTING THE LIGHT INTENSITY IN A CIRCULAR AREA CENTERED AT AND INCLUDING THE CENTRAL MAXIMA OF THE FOURIER TRANSFORM; (G) COMPARING THE DETECTED LIGHT INTENSITIES FROM SAID TWO BEAMS TO FIND THEIR DIFFERENCE; AND, (H) REMOVING SAID FRAME FROM SAID DEVELOPER TO A FIXER WHEN SAID DIFFERENCE REACHES A PREDETERMINED LEVEL.
Claim 2
Dependent Claim
73 words
A METHOD OF CONTROLLING PHOTOGRAPHIC DEVELOPMENT IN ACCORDANCE WITH CLAIM 5 WHEREIN SAID LIGHT INTENSITIES ARE DETECTED AS ELECTRICAL SIGNALS AND SAID REMOVING SAID FRAME FROM THE DEVELOPER IS CONTROLLED BY A THRESHOLD SENSITIVE DEVICE, A MOTOR CONTROL AMPLIFIER RESPONSIVE TO SAID DEVICE AND A MOTOR RESPONSIVE TO SAID AMPLIFIER OPERABLE TO MOVE SAID FRAME THROUGH A SEQUENCE OF PROCESSING POSITIONS, SAID THRESHOLD SENSITIVE DEVICE ACTIVATED BY SAID DIFFERENCE REACHING SAID PREDETERMINED LEVEL.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-18 | 1971-12-18 | 1972-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-18 | 1975-12-18 | 1976-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-18 | 1979-12-18 | 1980-06-18 | $7700.00 | Window Closed / Lapsed |