US4161406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solution and method for processing high speed video news film
Assignee: Philip A Hunt Chemical Corp
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Filing: 1977-12-07
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Granted: 1979-07-17
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Expires: 1997-12-07
Abstract
Abstract A high speed color reversal cine film with latent images recorded thereon is so processed as to color-develop the latent images and concurrently reduce the high contrast at the dark end of the tone scale which is inherent in the prior art development of such film. The new method utilizes in the color developer bath increased amounts (in comparison with prior art color developer baths) of a competing coupler such as citrazinic acid and of a silver halide solvent such as ethylene diamine and reduces the amount of a reversal agent such as t-butylamine borane, and also includes a competing non-coupling developer such as 4-hydroxymethyl-4-methyl-1-phenyl-3-pyrazolidone, or phenidone, or a derivative thereof.
Inventors
- 👤 David K. Bulloch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:59
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/50; G03C7/00; G03C7/30; G03C7/407; G03C7/413
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
181 words
A bath for color development of imagewise exposed VNF high speed color reversal cine film the emulsion of which contains latent silver halide images and which incorporates color couplers, said film having been black and white developed and having thereafter been stopped, the color developing bath concurrently reducing contrast without flashing, which color developer bath includes water, a calcium sequestering agent, an anti-oxidant, a buffer, a restrainer, an alkalizing agent and a color developing agent, that improvement comprising: (A) the absence of benzyl alcohol from said color developer bath, (B) the inclusion in said color developer bath of a competing coupler selected from the group consisting of 3-5 g./l. of citrazinic acid and 0.3-0.8 g./l. of 1-amino-8-naphthol-3, 6-disulfonic acid, 6-12 g./l. of the silver halide solvent ethylene diamine, 0-0.015 g./l. of the reversal and contrast control agent t-butylamine borane and 0.05-0.3 g./l. of a competing non-coupling developer selected from the group consisting of 4-hydroxymethyl-4-methyl-1-phenyl-3-pyrazolidone, phenidone and phenidone derivatives, (C) the pH of the color developer bath being about 11.7, (D) and which film after color development is stopped, bleached and fixed.
Claim 2
Dependent Claim
181 words
A bath for color development of imagewise exposed VNF high speed color reversal cine film the emulsion of which contains latent silver halide images and which incorporates color couplers, said film having been black and white developed and having thereafter been stopped, the color developing bath concurrently reducing contrast without flashing, which color developer bath includes water, a calcium sequestering agent, an anti-oxidant, a buffer, a restrainer, an alkalizing agent and a color developing agent, that improvement comprising: (A) the absence of benzyl alcohol from said color developer bath, (B) the inclusion in said color developer bath of a competing coupler selected from the group consisting of 3-5 g./l. of citrazinic acid and 0.3-0.8 g./l. of 1-amino-8-naphthol-3, 6-disulfonic acid, 6-12 g./l. of the silver halide solvent ethylene diamine, 0-0.015 g./l. of the reversal and contrast control agent t-butylamine borane and 0.05-0.3 g./l. of a competing non-coupling developer selected from the group consisting of 4-hydroxymethyl-4-methyl-1-phenyl-3-pyrazolidone, phenidone and phenidone derivatives, (C) the pH of the color developer bath being about 11.7, (D) and which film after color development is stopped, bleached and fixed.
Claim 3
Dependent Claim
33 words
A bath as set forth in claim 1 wherein: the competing coupler is 3.5 g./l. of citrazinic acid, and there is 9 g./l. ethylene diamine, 0.017 g./l. t-butylamine borane, and 0.11 g./l. 4-hydroxymethyl-4-methyl-1-phenyl-3-pyrazolidone.
Claim 4
Dependent Claim
172 words
In a method of color developing of VNF high speed color reversal cine film the emulsion of which contains latent silver halide images and which incorporates color couplers, said film having been black and white developed and having thereafter been stopped, the color developing bath concurrently reducing contrast without flashing, that improvement comprising treating said film in a bath which includes water, a calcium sequestering agent, an anti-oxidant, a buffer, a restrainer, an alkalizing agent and a color developing agent characterized in that said color developing bath has no benzyl alcohol and includes a competing coupler from the group consisting of 3-5 g/l of citrazinic and 0.3-0.8 g/l of 1-amino-8-naphthol-3, 6-disulfonic acid, 6-12 g/l of the silver halide solvent ethylene diamine, 0-0.015 g/l of the reversal and contrast control agent t-butylamine borane and 0.05-0.3 g/l of a competing non-coupling developer selected from the group consisting of 4-hydroxymethyl-4-methyl-1-phenyl-3-pyrazolidone, phenidone and phenidone derivatives, the pH of said color developing bath being about 11.7, and the film after color development being stopped, bleached and fixed.
Claim 5
Dependent Claim
172 words
In a method of color developing of VNF high speed color reversal cine film the emulsion of which contains latent silver halide images and which incorporates color couplers, said film having been black and white developed and having thereafter been stopped, the color developing bath concurrently reducing contrast without flashing, that improvement comprising treating said film in a bath which includes water, a calcium sequestering agent, an anti-oxidant, a buffer, a restrainer, an alkalizing agent and a color developing agent characterized in that said color developing bath has no benzyl alcohol and includes a competing coupler from the group consisting of 3-5 g/l of citrazinic and 0.3-0.8 g/l of 1-amino-8-naphthol-3, 6-disulfonic acid, 6-12 g/l of the silver halide solvent ethylene diamine, 0-0.015 g/l of the reversal and contrast control agent t-butylamine borane and 0.05-0.3 g/l of a competing non-coupling developer selected from the group consisting of 4-hydroxymethyl-4-methyl-1-phenyl-3-pyrazolidone, phenidone and phenidone derivatives, the pH of said color developing bath being about 11.7, and the film after color development being stopped, bleached and fixed.
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) | 1982-07-16 | 1983-01-15 | 1983-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-16 | 1987-01-15 | 1987-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-16 | 1991-01-15 | 1991-07-17 | $7700.00 | Window Closed / Lapsed |