Patent US4252894A successfully refreshed from Google Patents.
US4252894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrophilic color coupler composition containing diepoxide
Assignee: Eastman Kodak Co
•
Filing: 1975-10-22
•
Granted: 1981-02-24
•
Expires: 1995-10-22
Abstract
Abstract Hydrophilic coupler-oil solutions are stabilized by the addition of an epoxide compound. These coupler compounds are dissolved, with the aid of epoxide compounds, in high boiling esters and dispersed in aqueous gel solutions to form dispersions of improved stability.
Inventors
- 👤 Felix Viro
- 👤 Salvatore Emmi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:26
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/388
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
65 words
A method for preparing a dispersion of stabilized hydrophilic color coupler in a gelatin silver halide emulsion which comprises dissolving said hydrophilic color coupler in a high boiling, photographically inert ester and a diepoxide, dispersing the coupler-ester solution in an aqueous gel solution containing a suitable anionic surfactant to form a first dispersion and adding this dispersion to an aqueous gelatin silver halide gel emulsion.
Claim 2
Independent Claim
65 words
A method for preparing a dispersion of stabilized hydrophilic color coupler in a gelatin silver halide emulsion which comprises dissolving said hydrophilic color coupler in a high boiling, photographically inert ester and a diepoxide, dispersing the coupler-ester solution in an aqueous gel solution containing a suitable anionic surfactant to form a first dispersion and adding this dispersion to an aqueous gelatin silver halide gel emulsion.
Claim 3
Dependent Claim
17 words
A method as set forth in claim 1 wherein the anionic surfactant is sodium alkyl napthalene sulfonate.
References Cited (Backward Citations)
US2322027A
Cited
US3316094A
Cited
US3409435A
Cited
US3287134A
Cited
US3725080A
Cited
US3960569A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |