US3887333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid sensitometry process for photographic emulsions
Assignee: Individual
•
Filing: 1973-11-09
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Granted: 1975-06-03
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Expires: 1993-11-09
Abstract
Abstract A process for measuring the photographic properties of an emulsion such as a silver halide by comparing the properties of a first sample of the emulsion that has been exposed to a set quantity of light to a second sample that has not been exposed. Both samples are stirred to insure a uniform mixture and a developer is added to both samples. At the same time, light absorption of both samples is recorded with the help of a pair of fiber optic tubes which are submerged respectively in both samples. The fiber optic tubes transmit light which is nonreactive to the emulsion such as light near the infrared spectrum. The resultant values can be plotted to determine the photographic values.
Inventors
- 👤 Norihisa Mimura
- 👤 Takao Uehaka
- 👤 Hisatoyo Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:53
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/02; G01; G01J; G01J1/00; G01J1/42
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
120 words
A process of continuously determining the photographic characteristics of a photographic silver halide emulsion, which process comprises the steps of: a adding a developing solution to a first sample of a photographic emulsion which has not been exposed to light and to a second sample of the photographic emulsion which has been exposed to a predetermined quantity of light; b continuously measuring the development rate during the development of each of said samples by using light having a wavelength to which the photographic emulsion is not sensitive and measuring the amount of said light absorbed by each of said samples; and c comparing the resultant measurements for each of said samples to determine the photographic properties of the photographic emulsion.
Claim 2
Dependent Claim
120 words
A process of continuously determining the photographic characteristics of a photographic silver halide emulsion, which process comprises the steps of: a adding a developing solution to a first sample of a photographic emulsion which has not been exposed to light and to a second sample of the photographic emulsion which has been exposed to a predetermined quantity of light; b continuously measuring the development rate during the development of each of said samples by using light having a wavelength to which the photographic emulsion is not sensitive and measuring the amount of said light absorbed by each of said samples; and c comparing the resultant measurements for each of said samples to determine the photographic properties of the photographic emulsion.
Claim 3
Dependent Claim
119 words
A PROCESS OF CONTINUOUSLY DTERMINING THE PHOTOGRAPHIC CHARACTERISTICS OF A PHOTOGRAPHIC SILVER HALIDE EMULSION, WHICH PROCESS COOPRISES THE STEPS OF: A ADDING A DEVELOPING SOLUTION TO A FIRST SAMPLE OF A PHOTOGRAPHIC EMULSION WHICH HAS NOT BEEN EXPOSED TO LIGHT AND TO A SECOND SAMPLE OF THE PHOTOGRAPHIC EMULSION WHICH HAS BEEN EXPOSED TO A PREDETERMINED QUANTITY OF LIGHT B CONTINUOUSLY MEASURING THE DEVELOPMENT RATE DURING THE DEVELOPEMENT OF EACH OF SAID SAMPLE BY USING LIGHT HAVING A WAVELENGTH TO WHICH THE PHOTOGRAPHIC EMULSION IS NOT SENSITIVE AND MEASURING THE AMOUNT OF SAID LIGHT ABSORBED BY EACH OF SAID SAMPLES; AND C COMPARING THE RESULTANT MEASUREMENT FOR EACH OF SAID SAMPLES TO DEERMINE THEPHOTOGRAPHIC PROPERTIES OF THE PHOTOGRAPHIC EMULSION.
Claim 4
Dependent Claim
119 words
A PROCESS OF CONTINUOUSLY DTERMINING THE PHOTOGRAPHIC CHARACTERISTICS OF A PHOTOGRAPHIC SILVER HALIDE EMULSION, WHICH PROCESS COOPRISES THE STEPS OF: A ADDING A DEVELOPING SOLUTION TO A FIRST SAMPLE OF A PHOTOGRAPHIC EMULSION WHICH HAS NOT BEEN EXPOSED TO LIGHT AND TO A SECOND SAMPLE OF THE PHOTOGRAPHIC EMULSION WHICH HAS BEEN EXPOSED TO A PREDETERMINED QUANTITY OF LIGHT B CONTINUOUSLY MEASURING THE DEVELOPMENT RATE DURING THE DEVELOPEMENT OF EACH OF SAID SAMPLE BY USING LIGHT HAVING A WAVELENGTH TO WHICH THE PHOTOGRAPHIC EMULSION IS NOT SENSITIVE AND MEASURING THE AMOUNT OF SAID LIGHT ABSORBED BY EACH OF SAID SAMPLES; AND C COMPARING THE RESULTANT MEASUREMENT FOR EACH OF SAID SAMPLES TO DEERMINE THEPHOTOGRAPHIC PROPERTIES OF THE PHOTOGRAPHIC EMULSION.
Claim 5
Dependent Claim
23 words
The process of claim 1, including the further step of continuously stirring each of said first and second samples to ensure uniform samples.
Claim 6
Dependent Claim
36 words
The process of claim 1 wherein the wavelength of the light used to continuously measure the development rate of the emulsion during the development of each of said samples has a wavelength in the infrared spectrum.
Claim 7
Dependent Claim
56 words
The process of claim 3, including the further step of continuously stirring each of said first and second samples to ensure uniform samples and wherein the light used to continuously measure the development rate of the emulsion during the development of each of said samples is transmitted by a pair of optical fibers in each sample.
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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |