Patent US3923524A successfully refreshed from Google Patents.
US3923524A
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Fogged direct positive silver halide emulsions containing photographic sensitizing dyes derived from substituted salicylaldehydes
Assignee: Eastman Kodak Co
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Filing: 1973-10-29
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Granted: 1975-12-02
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Expires: 1993-10-29
Abstract
Abstract Cyanine and merocyanine photographic sensitizing dyes derived from substituted salicylaldehydes and light sensitive silver halide emulsions containing such dyes are disclosed. Also disclosed are certain reversible spiropyranmerocyanine dye systems, the stabilization of a dye in either the spiropyran form or the merocyanine form and observations of these photochromic materials when coated in polymeric matrices.
Inventors
- 👤 Jan Raymond Haase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:51
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/10; G03C1/12; G03C1/22; G03C1/685
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
23 words
A FOGGED DIRECT POSITIVE PHOTOGRAPHIC SILVER HALIDE EMULSION CONTAINING AT LEAST ONE PHOTOGRAPHIC SILVER HALIDE SENSITIZING DYE SELECTED FROM THOSE HAVING THE FORMULAS:
Claim 2
Dependent Claim
23 words
A FOGGED DIRECT POSITIVE PHOTOGRAPHIC SILVER HALIDE EMULSION CONTAINING AT LEAST ONE PHOTOGRAPHIC SILVER HALIDE SENSITIZING DYE SELECTED FROM THOSE HAVING THE FORMULAS:
Claim 3
Dependent Claim
18 words
A fogged direct positive photographic silver halide emulsion containing a photographic silver halide sensitizing dye of the formula:
Claim 4
Dependent Claim
18 words
A fogged direct positive photographic silver halide emulsion containing a photographic silver halide sensitizing dye of the formula:
Claim 5
Dependent Claim
18 words
A fogged direct positive photographic silver halide emulsion containing a photographic silver halide sensitizing dye of the formula:
Claim 6
Dependent Claim
18 words
A fogged direct positive photographic silver halide emulsion containing a photographic silver halide sensitizing dye of the formula:
Claim 7
Dependent Claim
17 words
A photographic silver halide emulsion as defined in claim 1 wherein said sensitizing dye is 1'',3''-diethyl-2'',3''-dihydro-6-nitrospiro(2H)-1-benzopyran-2,2''-1H -imidazo(4,5-b)quinoxaline.
Claim 8
Dependent Claim
17 words
A photographic silver halide emulsion as defined in claim 1 wherein said sensitizing dye is 6-((1-methylnaphtho-(1,2-d)thiazolin-2-ylidene)ethylidene)-4-nitro-2,4 -cyclohexadienone.
Claim 9
Dependent Claim
16 words
A photographic silver halide emulsion as defined in claim 1 wherein said sensitizing dye is 6((3-ethylbenzoselenazolinylidene)ethylidene)-4-nitro-2,4-cyclohexadienone.
Claim 10
Dependent Claim
17 words
A photographic silver halide emulsion as defined in claim 1 wherein said sensitizing dye is 6-((1-ethylnaphtho-( 2,3-d)thiazolin-2-ylidene)ethylidene)-4-nitro-2,4-cyclohexadienone.
Claim 11
Dependent Claim
17 words
A photographic silver halide emulsion as defined in claim 1 wherein said sensitizing dye is 6-((3-ethyl-2-benzothiazolinylidene)ethylidene)-4-nitro-2,4 -cyclohexadienone.
Claim 12
Dependent Claim
32 words
A photographic silver halide emulsion as defined in claim 1 wherein said sensitizing dye is selected from the group consisting of 6-((1-ethylnaphtho(1,2-d)thiazolin-2-ylidene)ethylidene)-4-nitro-2,4 -cyclohexadienone; 6-nitro-2'',3''-dihydro-1'',3'',3''-trimethylspiro(2H)-1-benzopyran2, 2''-(1H)-pyrrolo(2,3-b)pyridine; 6-((1,3-diethyl-2-benzimidazolinylidene)ethylidene)-4-nitro2,4 -cyclohexadienone; 6-((1-ethyl-4-(1H)-quinolylidene)ethylidene)-4-nitro-2,4-cyclohexadienone; 6-((5,6-dichloro-1,3-diethyl-2-benzimidazolinylidene)ethylidene)-4-nitro-2,4-cyclohexadienone; and 6-((3,4-diphenyl-4-thiazolin-2-ylidene)ethylidene)-4-nitro2,4 -cyclohexadienone.
Claim 13
Dependent Claim
34 words
A fogged direct positive photographic element comprising a support having thereon at least one layer of a photographic silver halide emulsion containing at least one photographic sensitizing dye selected from those having the formulas:
Claim 14
Dependent Claim
34 words
A fogged direct positive photographic element comprising a support having thereon at least one layer of a photographic silver halide emulsion containing at least one photographic sensitizing dye selected from those having the formulas:
Claim 15
Dependent Claim
31 words
A fogged direct positive photographic elEment comprising a support having thereon at least one layer of a photographic silver halide emulsion containing at least one photographic sensitizing dye of the formula:
Claim 16
Dependent Claim
31 words
A fogged direct positive photographic elEment comprising a support having thereon at least one layer of a photographic silver halide emulsion containing at least one photographic sensitizing dye of the formula:
Claim 17
Dependent Claim
31 words
A fogged direct positive photographic element comprising a support having thereon at least one layer of a photographic silver halide emulsion containing at least one photographic sensitizing dye of the formula:
Claim 18
Dependent Claim
31 words
A fogged direct positive photographic element comprising a support having thereon at least one layer of a photographic silver halide emulsion containing at least one photographic sensitizing dye of the formula:
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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |