US3617291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-equivalent couplers for photography
Assignee: Eastman Kodak Co
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Filing: 1967-10-10
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Granted: 1971-11-02
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Expires: 1987-10-10
Abstract
Abstract Two-equivalent development inhibitor releasing couplers derived from four-equivalent couplers by replacing a single hydrogen atom on the carbon atom in the reactive coupling position with a benzotriazolyl radical are valuable couplers for use in photographic materials and processes. The immediate couplers including the 2,6-biscoupler benzo(1,2-d:4,5-d'')bistriazoles absorb ultraviolet light, fluoresce and have good stability to exposure to light, heat, humidity and aldehyde hardening agents, and couple actively to produce good dyes having excellent stability to heat and light.
Inventors
- 👤 George W Sawdey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:46
CPC Classifications
C; C07; C07D; C07D249/00; C07D249/16; C07D249/18; C07D249/20; C07D249/22; G; G03; G03C; G03C1/00; G03C1/76; G03C1/815; G03C1/8155; G03C7/00; G03C7/30; G03C7/305; G03C7/30541; G03C7/392; Y; Y10; Y10S; Y10S430/00; Y10S430/156; Y10S430/158
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
18 words
A hydrophilic colloid silver halide emulsion of claim 1 in which the two-equivalent dye-forming coupler has the formula:
Claim 2
Dependent Claim
14 words
An emulsion of claim 1 in which the coupler is Alpha -benzotriazolyl- Alpha -benzoylacetanilide.
Claim 3
Dependent Claim
14 words
An emulsion of claim 1 in which the coupler is Alpha -benzotriazolyl- Alpha -pivalylacetanilide.
Claim 4
Dependent Claim
14 words
An emulsion of claim 1 in which the coupler is Alpha -benzotriazolyl- Alpha -cyanoacetylcoumarone.
Claim 5
Dependent Claim
13 words
An emulsion of claim 1 in which the coupler is 4-benzotriazolyl-2-( delta -(2,4-diamylphenoxybutyl)-1-hydroxynaphthamide.
Claim 6
Dependent Claim
11 words
An emulsion of claim 1 in which the coupler is 4-benzothiazolyl-3-pentadecyl-1-phenyl-5-pyrazolone.
Claim 7
Dependent Claim
11 words
An emulsion of claim 1 in which the coupler is 4-benzotriazolyl-3-methyl-1-phenyl-5-pyrazolone.
Claim 8
Dependent Claim
14 words
An emulsion of claim 1 in which the coupler is 4-benzotriazolyl-1-(2,4,6-trichlorophenyl)-3-(3 Alpha -(2,4-di-tert-amylphenoxy)acetamido benzamido)-5-pyrazolone.
Claim 9
Dependent Claim
23 words
A hydrophilic colloid silver halide emulsion containing a two-equivalent dye-forming coupler having substituted on the carbon in the coupling position a benzotriazolyl radical.
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) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |