Process using cobalt (ii) or manganese (ii) as a developing agent
Abstract
Abstract A PROCESS FOR DEVELOPING SILVER HALIDE EMULSION LAYERS BY INCORPORATING THEREWITH A SALT OF COPPER (I), COBALT (II), OR MANGANESE (II), EXPOSING THE ELEMENT IMAGEWISE, REACTING SAID SALT WITH A NITROGEN DONOR COMPLEXING AGENT, E.G., AMMONIA OR AN ALIPHATIC AMINE OF 1-6 CARBONS WHICH MAY BE FORMED FROM A COMPOUND WHICH GENERATES SUCH AN AGENT UPON HYDROLYSIS AND/OR BY HEAT, E.G., SALTS OF THE AMINES, AND UREA OR POTASSIUM CYANATE IN THE PRESENCE OF WATER TO DEVELOP THE EXPOSED SILVER HALIDE. WHEN A COPPER SALT IS EMPLOYED AN ALIPHATIC AMINE IS USED. THE INVENTION IS USEFUL WITH HIGH SPEED NEGATIVE EMULSIONS, GRAPHIC ARTS EMULSIONS, RADIOGRAPHIC EMULSIONS, AND PAPER EMULSIONS.
Inventors
- 👤 Joseph A Sincius
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |