Patent US3640715A successfully refreshed from Google Patents.
US3640715A
Expired / Lapsed
US
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Photographic silver halide emulsion containing as a sensitizer bio-quarternary salts of bis-aminoalkyl-disulfides
Assignee: Agfa Gevaert AG
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Filing: 1969-12-17
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Granted: 1972-02-08
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Expires: 1989-12-17
Abstract
Abstract The sensitivity of photographic silver halide emulsions can be increased and the fogging of those emulsions can be decreased by using bis-quaternary salts of bis-aminoalkyl-disulfides of the following formula: WHEREIN R is alkyl, two R radicals at the same N may form together with the N a heterocyclic ring; R'' is alkyl or aralkyl; N is 1-6, and X is any anion; THE COMPOUNDS CAN BE USED AS RIPENING AGENTS OR AS ADDITIVES TO THE CASTING SOLUTION OR TO THE DEVELOPER.
Inventors
- 👤 Harald Huckstadt
- 👤 Wilhelm Saleck
- 👤 August Randolph
- 👤 Franz Moll
- 👤 Erwin Ranz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:54
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/34; G03C1/346; G03C1/08; G03C1/09
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
19 words
A light-sensitive photographic material according to claim 1, wherein the silver halide emulsion layer in addition contains color couplers.
Claim 2
Dependent Claim
16 words
A light-sensitive photographic material according to claim 1, which contains a compound of the following formula:
Claim 3
Dependent Claim
16 words
A light-sensitive photographic material according to claim 1, which contains a compound of the following formula:
Claim 4
Dependent Claim
135 words
In the process for the production of photographic images in black-and-white or color by exposing a photographic material with at least one silver halide emulsion layer, developing in a black-and-white or color forming developer and fixing the improvement by which the development of the exposed photographic material takes place in the presence of a sensitizing amount of a compound of the following formula: wherein R an alkyl radical having up to six carbon atoms; two R radicals attached to the same nitrogen atom may, with this nitrogen atom, form a 5-, 6- or 7-membered ring containing at least one hetero atom; R'' an alkyl radical having up to six carbon atoms, or an aralkyl radical; n an integer of from 1 to 6; X- any anion; X- is absent when R'' contains a carboxylate group.
Claim 5
Dependent Claim
23 words
The process according to claim 5, wherein the development is carried out with a color forming developer in the presence of color couplers.
Claim 6
Dependent Claim
22 words
The process according to claim 5, wherein the development is carried out in the presence of a compound of the following formula:
Claim 7
Dependent Claim
22 words
The process according to claim 5, wherein the development is carried out in the presence of a compound of the following formula:
Claim 8
Dependent Claim
122 words
In the process for the production of photographic silver halide emulsions by precipitating the silver halide in the presence of a protective colloid, washing and chemical ripening, the improvement by which the chemical ripening is carried out in the presence of an effective amount of a compound of the following formula: wherein R an alkyl radical having up to six carbon atoms; two R radicals attached to the same nitrogen atom may with this nitrogen atom form a 5-, 6- or 7-membered ring containing at least one hetero atom; R'' an alkyl radical having up to six carbon atoms or an aralkyl radical; n an integer from 1 to 6; X- any anion; X- is absent when R'' contains a carboxylate group.
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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |