US3410685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct-positive images by the silver salt diffusion process
Assignee: Agfa Gevaert NV
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Filing: 1963-04-22
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Granted: 1968-11-12
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Expires: 1983-04-22
Abstract
No abstract record available.
Inventors
- 👤 Schaum Gustav
- 👤 Pfeiffenschneider Raymund
- 👤 Rintelen Harald Von
- 👤 Weyde Edith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:46
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/04; G03C8/06; G03C8/24; G03C8/26; G03C8/28; G03C8/42; G03C8/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
IN THE PROCESS OF PREPARING A PHOTOCOPY BY THE SILVER SALT DIFFUSION PROCESS USING A SUPPORTED LIGHT-SENSITIVE SILVER HALIDE EMULSION WHICH IN TURN SUPPORTS A TRANSFER LAYER THAT IS ORIGINALLY HELD ONLY ON THE EMULSION BUT AS PART OF THE PROCESSING IS TRANSFERRED TO A SEPARATE SUPPORT ON WHICH THE DESIRED POSITIVE IMAGE IS FINALLY CARRIED, THE IMPROVEMENT ACCORDING TO WHICH THE TRANSFER LAYER IS ESSENTIALLY AN ALKALI METAL ALGINATE TRANSFER LAYER, AND THE EMULSION IS IN HARDENED GELATIN THAT HAS A SOFTENING POINT AT LEAST AS HIGH AS 100%*C.
Claim 2
Dependent Claim
90 words
IN THE PROCESS OF PREPARING A PHOTOCOPY BY THE SILVER SALT DIFFUSION PROCESS USING A SUPPORTED LIGHT-SENSITIVE SILVER HALIDE EMULSION WHICH IN TURN SUPPORTS A TRANSFER LAYER THAT IS ORIGINALLY HELD ONLY ON THE EMULSION BUT AS PART OF THE PROCESSING IS TRANSFERRED TO A SEPARATE SUPPORT ON WHICH THE DESIRED POSITIVE IMAGE IS FINALLY CARRIED, THE IMPROVEMENT ACCORDING TO WHICH THE TRANSFER LAYER IS ESSENTIALLY AN ALKALI METAL ALGINATE TRANSFER LAYER, AND THE EMULSION IS IN HARDENED GELATIN THAT HAS A SOFTENING POINT AT LEAST AS HIGH AS 100%*C.
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) | 1971-11-12 | 1972-05-13 | 1972-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-12 | 1976-05-13 | 1976-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-12 | 1980-05-13 | 1980-11-12 | $7700.00 | Window Closed / Lapsed |