Patent US1998749A successfully refreshed from Google Patents.
Patent US4040825A successfully refreshed from Google Patents.
US4040825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spectral sensitization of photographic material with natural colloids containing sensitizing dye groups
Assignee: Ilford Imaging UK Ltd
•
Filing: 1976-03-11
•
Granted: 1977-08-09
•
Expires: 1996-03-11
Abstract
Abstract The present invention relates to light-sensitive photographic material with a light-sensitive heavy metal compound, e.g. a silver halide, and a spectral sensitizer. The spectral sensitizer is a compound in which the radicals of a sensitizing dyestuff are covalently bonded to amino, imino, hydroxyl, mercapto, carboxylic acid or carboxylic acid amide groups of a natural hydrophilic colloid, preferably gelatin. The invention also relates to new sensitizing dyes which are dinuclear cyanine dyes or merocyanine dyes which have attached either to a heterocyclic nucleus of the dye or to its methine chain a group which is reactive with a hydrophilic colloid.
Inventors
- 👤 Rolf Steiger
- 👤 Jean-Francois Reber
- 👤 Aaron David Ezekiel
- 👤 Geoffrey Ernest Ficken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:44
CPC Classifications
C; C09; C09B; C09B62/00; C09B62/002; C09B62/0025; G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/10; G03C1/12; G03C1/705
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
48 words
Light-sensitive photographic material with a light-sensitive heavy metal compound and a spectral sensitiser, wherein the spectral sensitiser is a compound in which the radicals of a sensitising dyestuff are covalently bonded to amino, imino, hydroxyl, mercapto, carboxylic acid or carboxylic acid amide groups of a natural hydrophilic colloid.
Claim 2
Dependent Claim
48 words
Light-sensitive photographic material with a light-sensitive heavy metal compound and a spectral sensitiser, wherein the spectral sensitiser is a compound in which the radicals of a sensitising dyestuff are covalently bonded to amino, imino, hydroxyl, mercapto, carboxylic acid or carboxylic acid amide groups of a natural hydrophilic colloid.
Claim 3
Dependent Claim
24 words
Photographic material according to claim 1, wherein the spectral sensitiser is a compound obtained by reacting, a cyanine dyestuff with the natural hydrophilic colloid.
Claim 4
Dependent Claim
29 words
Photographic material according to claim 1, wherein the spectral sensitiser is a compound obtained by reacting a sensitising dyestuff which contains a chlorotriazine radical with the natural hydrophilic colloid.
Claim 5
Dependent Claim
30 words
Photographic material according to claim 1, wherein the spectral sensitiser is a compound obtained by reacting rhodamine isocyanate or a dyestuff of the formulae ##STR71## with the natural hydrophilic colloid.
Claim 6
Dependent Claim
13 words
Photographic material according to claim 1, wherein the natural hydrophilic colloid is gelatine.
Claim 7
Dependent Claim
19 words
Photographic material according to claim 1, which contains a light-sensitive silver halide as the light sensitive heavy metal compound.
Claim 8
Dependent Claim
28 words
Photographic material according to claim 1, which additionally contains at least one sensitising dyestuff which is not bonded to a hydrophilic colloid and is free from reactive groups.
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) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |