US3864082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of continuously measuring the progress of development of photographic emulsions
Assignee: Fujifilm Holdings Corp
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Filing: 1973-02-14
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Granted: 1975-02-04
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Expires: 1993-02-14
Abstract
Abstract The progress of the development of a silver halide photographic emulsion is continuously measured by suitably exposing a dilute liquid silver halide photographic emulsion, uniformly mixing the emulsion with a developer, continuously passing the mixture through a flow cell and continuously measuring the absorbance of the reduced silver in the emulsion passing through the cell.
Inventors
- 👤 Hisatoyo Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:18
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; Y; Y10; Y10T; Y10T436/00; Y10T436/11; Y10T436/117497; Y10T436/25; Y10T436/25625
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
77 words
A METHOD OF CONTINUOUSLY MEASURING THE PROGRESS OF DEVELOPMENT OF A SILVER HALIDE PHOTOGRAPHIC EMULSION WHICH COMPRISES MIXING A LIQUID SILNER HOLIDE PHOTOGRAPHIC EMULSION AND A DEVELOPER, CONTINUOUSLY PASSING THE MIXTURE THROUGH A FLOW CELL WITHOUT ADDING THERETO A FIXING SOLUTION OR A STOPPING SOLUTION, IRRADIATING THE MIXTURE PASSING THROUGH THE FLOW CELL WITH MEASUREMENT LIGHT HAVING ANY DESIRED WAVE LENGTH MEASURING THE ABSORBANCE OF THE PHOTOGRAPHIC EMULSION, AND IMMEDIATELY WITHDRAWING THE MIXTURE FROM THE FLOW CELL.
Claim 2
Independent Claim
77 words
A METHOD OF CONTINUOUSLY MEASURING THE PROGRESS OF DEVELOPMENT OF A SILVER HALIDE PHOTOGRAPHIC EMULSION WHICH COMPRISES MIXING A LIQUID SILNER HOLIDE PHOTOGRAPHIC EMULSION AND A DEVELOPER, CONTINUOUSLY PASSING THE MIXTURE THROUGH A FLOW CELL WITHOUT ADDING THERETO A FIXING SOLUTION OR A STOPPING SOLUTION, IRRADIATING THE MIXTURE PASSING THROUGH THE FLOW CELL WITH MEASUREMENT LIGHT HAVING ANY DESIRED WAVE LENGTH MEASURING THE ABSORBANCE OF THE PHOTOGRAPHIC EMULSION, AND IMMEDIATELY WITHDRAWING THE MIXTURE FROM THE FLOW CELL.
Claim 3
Dependent Claim
25 words
THE METHOD AS SET FORTH IN CLAIM 1 WHEREIN SAID PHOTOGRAPHIC EMULSION IS EXPOSED TO LIGHT PRIOR TO LIGHT BEING INTRODUCED INTO THE FLOW CELL.
Claim 4
Dependent Claim
26 words
The method as set forth in claim 1 wherein said photographic emulsion is diluted with water or an aqueous gelatin solution before mixing with the developer.
Claim 5
Dependent Claim
23 words
The method as set forth in claim 3 wherein said photographic emulsion is diluted to about 1/10 to 1/1000 of its original concentration.
Claim 6
Dependent Claim
17 words
The method as set forth in claim 3 wherein said dilution is with an aqueous gelatin solution.
Claim 7
Dependent Claim
24 words
The method as set forth in claim 1 wherein the measurement light passes through a sample about 1 mm to about 10 mm thick.
Claim 8
Dependent Claim
25 words
The method as set forth in claim 6 where the absorbance of the photographic emulsion is in the range of about 0 to about 4.
Claim 9
Dependent Claim
15 words
The method as set forth in claim 6 where the silver halide emulsion comprises gelatin.
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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |