US4035188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
N-alkoxyethoxyethylphenylenediamine color developing agents
Assignee: Mitsubishi Paper Mills Ltd
•
Filing: 1975-03-31
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Granted: 1977-07-12
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Expires: 1995-03-31
Abstract
Abstract Novel compounds represented by the following general formula are useful as color developing agents for color development which react with couplers to form color images: <IMAGE> (wherein R1 and R2 which may be the same or different represent alkyl groups of 1 to 4 carbon atoms and R3 represents hydrogen atom or methyl group).
Inventors
- 👤 Kenji Yabuta
- 👤 Kiyoshi Yamashita
- 👤 Kiyoshi Futaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:39
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/407; G03C7/413; G03C7/4136
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
58 words
In a color developing solution containing a color developing agent, a preservative, a buffer and an antifogging agent the improvement comprising employing as the color developing agent a compound of the formula ##STR4## wherein R 1 and R 2 are alkyl of 1 to 4 carbon atoms and R 3 is hydrogen or methyl or a salt thereof.
Claim 2
Dependent Claim
58 words
In a color developing solution containing a color developing agent, a preservative, a buffer and an antifogging agent the improvement comprising employing as the color developing agent a compound of the formula ##STR4## wherein R 1 and R 2 are alkyl of 1 to 4 carbon atoms and R 3 is hydrogen or methyl or a salt thereof.
Claim 3
Dependent Claim
17 words
A color developing solution according to claim 1 including benzyl alcohol for acceleration of the coupling reaction.
Claim 4
Dependent Claim
13 words
A color developing solution according to claim 1 wherein R 3 is methyl.
Claim 5
Dependent Claim
29 words
A color developing solution according to claim 1 wherein R 1 is ethyl and R 3 is methyl and said compound is a salt of an aromatic sulfonic acid.
Claim 6
Dependent Claim
18 words
A color developing solution according to claim 4 wherein the salt is a salt of p-toluene sulfonic acid.
Claim 7
Dependent Claim
18 words
A color developing solution according to claim 1 wherein the compound is N-ethyl-N-[β-(β-methoxy) ethoxy]ethyl-3-methyl-p-phenylenediamine or a salt thereof.
Claim 8
Dependent Claim
18 words
A color developing solution acording to claim 1 wherein the compound is N-ethyl-N-[β-(β-ethoxy) ethoxy]ethyl-3-methyl-p-phenylenediamine or a salt thereof.
Claim 9
Dependent Claim
18 words
A color developing solution according to claim 1 wherein the compound is N-ethyl-N-[β-(β-butoxy) ethoxy]ethyl-3-methyl-p-phenylenediamine or a salt thereof.
Claim 10
Dependent Claim
18 words
A color developing solution according to claim 1 wherein the compound is N-methyl-N-[β-(β-methoxy) ethoxy]ethyl-3-methyl-p-phenylenediamine or a salt thereof.
Claim 11
Dependent Claim
18 words
A color developing solution according to claim 1 wherein the compound is N-methyl-N-[β-(β-ethoxy) ethoxy]ethyl-3-methyl-p-phenylenediamine or a salt thereof.
References Cited (Backward Citations)
US2684893A
Cited
US3656950A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |