US3615528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic silver halide emulsion having an increased sensitivity and reduced fogging
Assignee: Agfa Gevaert AG
•
Filing: 1969-12-09
•
Granted: 1971-10-26
•
Expires: 1989-12-09
Abstract
Abstract The sensitivity of light-sensitive photographic silver halide emulsions can be increased and the fogging can be decreased if the chemical ripening of that emulsions is performed in the presence of mercapto alkyl quaternary salts or acetothioalkyl quaternary salts of the following formula WHEREIN R represents alkyl with up to six carbon atoms; two R radicals of the same nitrogen can be combined to form a heterocyclic ring; R'' represents alkyl with up to six carbon atoms, which can be substituted, or an aralkyl group; R'''' represent H or -CO-CH3; n is one to six; and X is any anion.
Inventors
- 👤 Harald Huckstadt
- 👤 Wilhelm Saleck
- 👤 August Randolph
- 👤 Franz Moll
- 👤 Anita Von Koenig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:42
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/09; G03C1/34; G03C1/346
Claims Analysis
Total Claims: 10
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
16 words
A light-sensitive photographic material according to claim 1, which contains a compound of the following formula:
Claim 5
Dependent Claim
16 words
A light-sensitive photographic material according to claim 1, which contains a compound of the following formula:
Claim 6
Dependent Claim
16 words
A light-sensitive photographic material according to claim 1, which contains a compound of the following formula:
Claim 7
Dependent Claim
16 words
A light-sensitive photographic material according to claim 1, which contains a compound of the following formula:
Claim 8
Dependent Claim
158 words
In the process for the production of black-and-white or color images by developing an imagewise exposed light-sensitive photographic material which comprises at least one silver halide emulsion layer, the improvement according to which the development is carried out in the presence of a compound of the following formula: in which R represents an alkyl group having up to six carbon atoms; two R radicals attached to the same nitrogen atom may with the said nitrogen atom form a saturated five-, six- or seven-membered heterocyclic ring containing at least one hetero atom or an unsaturated heterocyclic ring, in the latter case R'' is not present; R'' represents an alkyl group having up to six carbon atoms, which may be substituted or an aralkyl group, the aryl radicals of which may be substituted; R'''' represents H or -CO-CH3; n is an integer of from 1 to 6; X is any anion; when R'' contains a carboxylate group, X is absent.
Claim 9
Dependent Claim
23 words
The process according to claim 9, wherein the exposed photographic material is developed with a color-forming developer in the presence of color couplers.
Claim 10
Dependent Claim
158 words
In the process for the preparation of photographic silver halide emulsions by precipitating the silver halide in the presence of a protective colloid, washing and chemical ripening the improvement according to which the chemical ripening is carried out in the presence of a compound of the following formula: in which R represents an alkyl group having up to six carbon atoms; two R radicals attached to the same nitrogen atom may with the said nitrogen atom form a saturated five-, six- or seven-membered heterocyclic ring containing at least one hetero atom or an unsaturated heterocyclic ring, in the latter case R'' is not present; R'' represents an alkyl group having up to six carbon atoms, which may be substituted or an aralkyl group, the aryl radicals of which may be substituted; R'''' represents H or -CO-CH3; n is an integer of from 1 to 6; X is any anion; when R'' contains a carboxylate group, X is absent.
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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |