US3856532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic silver halide emulsion containing a supersensitising combination
Assignee: Ilford Imaging UK Ltd
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Filing: 1973-04-18
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Granted: 1974-12-24
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Expires: 1993-04-18
Abstract
Abstract The present invention relates to a photographic silver halide emulsion or emulsion layer which comprises a super-sensitising combination of (1) a bis-benzothiazole or other bis-azole trimethincyanine dye and (2) a bis-benzimidazole trimethincyanine.
Inventors
- 👤 E Thurston
- 👤 J Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:02
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/28; G03C1/29
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
20 words
A PHOTOGRAPHIC SILVER HALIDE MATERIAL WHICH CONTAINS A SUPER-SENSITISING COMBINATION WHICH CONSISTS ESSENTIALLY OF A SENSITISING DYE OF THE FORMULA
Claim 2
Dependent Claim
20 words
A PHOTOGRAPHIC SILVER HALIDE MATERIAL WHICH CONTAINS A SUPER-SENSITISING COMBINATION WHICH CONSISTS ESSENTIALLY OF A SENSITISING DYE OF THE FORMULA
Claim 3
Dependent Claim
26 words
A silver halide material according to claim 1, wherein in the dye of the formula secondly set forth in claim 1 R9 is a sulphoalkyl group.
Claim 4
Dependent Claim
24 words
A photographic silver halide material according to claim 1, which contains a supersensitising combination which consists essentially of a sensitising dye of the formula
Claim 5
Dependent Claim
19 words
A photographic silver halide material according to claim 3 the symmetrical trimethincyanine dye of which corresponds to the formula
Claim 6
Dependent Claim
39 words
A silver halide material according to claim 1, which contains from 0.01 g to 0.5 g of each sensitising dye of the two formulae set forth in claim 1 per 1.5 g moles of silver present in the emulsion.
Claim 7
Dependent Claim
15 words
A photographic silver halide emulsion which contains a supersensitising combination as defined in claim 1.
Claim 8
Dependent Claim
16 words
A photographic silver halide emulsion layer which contains a supersensitising combination as defined in claim 1.
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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |