Photographic material
Abstract
Abstract THIS APPLICATION DESCRIBES A PROCESS FOR THE PRODUCTION OF DEVELOPED PHOTOGRAPHIC MATERIAL WHICH COMPRISES SUBJECTING PHOTPGRAPHIC LITH MATERIAL CONTAINING A LATENT SILVER IMAGE IN A SILVER HALIDE EMULSION LAYER TO DEVELOPLENT BY MEANS OF A FORMALDEHYDR/BISULPHITE.HYDROQUINONE LITHOGRAPHIC DEVELOPER, THE PROCESS BEING CHARACTERIZED IN THAT THE DEVELOPMENT TAKES PLACE IN THE PRESENCE OF A WATERSOLUBLE POLYETHYLENE OXIDE CHAIN (CH2CH2E)N WHERE N IS AN INTEGER FROM 5-200 AND AN ORGANIC MERCAPTO COMPOUND SELECTED FROM DIALKYL SUBSTITUTED THIOUREAS AND HETEROCYCLIC NITROGEN COMPOUNDS CONTAINING A MERCAPTO GROUP ATTACHED TO A CARBON ATOM WHICH IS IN THE ALPHA POSITION WITH RESPECT TO A NITROGEN ATOM IN THE HETEROCYCLIC RING.
Inventors
- 👤 D Douglas
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |