US3874948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver halide color developer containing ketomethylene photographic color-forming couplers
Assignee: Eastman Kodak Co
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Filing: 1974-05-01
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Granted: 1975-04-01
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Expires: 1994-05-01
Abstract
Abstract This invention relates to photographic elements and to photographic emulsions and photographic color developer compositions that contain certain color-forming couplers of the 1,2,4-benzothiadiazine-1,1-dioxide class having an open chain ketomethylene group on the carbon atom in the 3-position.
Inventors
- 👤 Stanley S Kertel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:51
CPC Classifications
C; C07; C07D; C07D285/00; C07D285/15; C07D285/16; C07D285/18; C07D285/20; C07D285/22; C07D285/24; G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/36; Y; Y10; Y10S; Y10S430/00; Y10S430/167
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
19 words
A COLOR DEVELOPING COMPOSITION COMPRISING A SILVER HALIDE COLOR DEVELOPING AGENT AND DIFFUSIBLE COLOR-FORMING COUPLER REPRESENTED BY THE FORMULA:
Claim 2
Dependent Claim
19 words
A COLOR DEVELOPING COMPOSITION COMPRISING A SILVER HALIDE COLOR DEVELOPING AGENT AND DIFFUSIBLE COLOR-FORMING COUPLER REPRESENTED BY THE FORMULA:
Claim 3
Dependent Claim
15 words
A color developing composition as in claim 1, wherein said diffusible color-forming coupler is 3-(carbethoxy)methyl-1,2,4-benzothiadiazine-1,1-dioxide.
Claim 4
Dependent Claim
16 words
A color developing composition as in claim 1, wherein said diffusible color-forming coupler is 3-((4-ethoxyphenyl) carbamyl)methyl-1,2,4-benzothiadiazine-1,1-dioxide.
Claim 5
Dependent Claim
16 words
A color developing composition as in claim 1, wherein said diffusible color-forming coupler is 3-(carbethoxy) methyl-6-chloro-1,2,4-benzothiadiazine-1,1-dioxide.
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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |