US2607684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct-positive photographic process
Assignee: Eastman Kodak Co
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Filing: 1949-09-24
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Granted: 1952-08-19
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Expires: 1969-09-24
Abstract
No abstract record available.
Inventors
- 👤 Chester J Nowak
- 👤 Ralph S Colt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:00
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/315
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
THE METHOD OF MAKING A DIRECT-POSITIVE PHOTOGRAPHIC ELIEF IMAGE IN A PHOTOGRAPHIC ELEMENT HAVING A SUPPORT SUBSTANTIALLY IMPERMEABLE TO PHOTOGRAPHIC DEVELOPING SOLUTION CARRYING A FOGGED SUBSTANTIALLY UNHARDENED GELATINO-SILVER HALIDE EMULSION STRATUM AND AN UNEXPOSED SUBSTANTIALLY UNHARDENED GELATINO-SILVER HALIDE EMULSION STRATUM OVER SAID FOGGED STRATUM, WHICH COMPRISES IMAGE-WISE EXPOSING SAID UNEXPOSED EMULSION LEAVING A STRATUM OF UNEXPOSED SOLUBLE EMULSION SEPARATING THE FOGGED STRATUM AND THE IMAGE-WISE EXPOSED STRATUM, DEVELOPING THE EXPOSED ELEMENT IN A TANNING DEVELOPER COMPOSITION TO SIMULTANEOUSLY FORM A POSITIVE SILVER AND TANNED GELATIN IMAGE ADJACENT THE SUPPORT, A NEGATIVE SILVER AND TANNED GELATIN IMAGE IN THE REGION OF THE IMAGE EXPOSURE, AND A STRATUM OF SOLUBLE EMULSION SEPARATING SAID TANNED IMAGES, THEREAFTER REMOVING SAID TANNED NEGATIVE IMAGE AND SOLUBLE EMULSION BY TREATMENT WITH HOT WATER LEAVING A POSITIVE RELIEF IMAGE ON SAID SUPPORT.
Claim 2
Independent Claim
135 words
THE METHOD OF MAKING A DIRECT-POSITIVE PHOTOGRAPHIC ELIEF IMAGE IN A PHOTOGRAPHIC ELEMENT HAVING A SUPPORT SUBSTANTIALLY IMPERMEABLE TO PHOTOGRAPHIC DEVELOPING SOLUTION CARRYING A FOGGED SUBSTANTIALLY UNHARDENED GELATINO-SILVER HALIDE EMULSION STRATUM AND AN UNEXPOSED SUBSTANTIALLY UNHARDENED GELATINO-SILVER HALIDE EMULSION STRATUM OVER SAID FOGGED STRATUM, WHICH COMPRISES IMAGE-WISE EXPOSING SAID UNEXPOSED EMULSION LEAVING A STRATUM OF UNEXPOSED SOLUBLE EMULSION SEPARATING THE FOGGED STRATUM AND THE IMAGE-WISE EXPOSED STRATUM, DEVELOPING THE EXPOSED ELEMENT IN A TANNING DEVELOPER COMPOSITION TO SIMULTANEOUSLY FORM A POSITIVE SILVER AND TANNED GELATIN IMAGE ADJACENT THE SUPPORT, A NEGATIVE SILVER AND TANNED GELATIN IMAGE IN THE REGION OF THE IMAGE EXPOSURE, AND A STRATUM OF SOLUBLE EMULSION SEPARATING SAID TANNED IMAGES, THEREAFTER REMOVING SAID TANNED NEGATIVE IMAGE AND SOLUBLE EMULSION BY TREATMENT WITH HOT WATER LEAVING A POSITIVE RELIEF IMAGE ON SAID SUPPORT.
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) | 1955-08-19 | 1956-02-18 | 1956-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-08-19 | 1960-02-18 | 1960-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-08-19 | 1964-02-18 | 1964-08-19 | $7700.00 | Window Closed / Lapsed |