US3174858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for obtaining multiple photographic positive images by diffusiontransfer
Assignee: Gevaert Photo Producten NV
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Filing: 1960-09-23
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Granted: 1965-03-23
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Expires: 1980-09-23
Abstract
No abstract record available.
Inventors
- 👤 Albert Emiel Van Hoof
- 👤 Hart Rene Maurice
- 👤 Willems Jozef Frans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:37
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/42; G03C8/52; G03C8/56; G03C8/02; G03C8/04; G03C8/06; G03C8/24; G03C8/26; G03C8/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A PROCESS FOR OBTAINING MULTIPLE COPIES FROM AN EXPOSED SILVER HALIDE EMULSION LAYER, WHICH COMPRISES CONTACTING SAID EMULSION LAYER WITH A FIRST RECEIVING LAYER CONTAINING DEVELOPMENT NUCLEI, B BINDING AGENT AND A WATER-SOLUBLE BASIC POLYMERIC QUATERNARY SALT, SAID POLYMERIC QUATERNARY SALT HAVING A POLYVINYL CHAIN, EACH MONOMERIC UNIT OF WHICH IS LINKED DIRECTLY TO A FIVE TO SIX-MEMBERED HETEROCYCLIC NUCLEUS CONTAINING AS HETEROATOMS ONLY NITROGEN ATOMS, ONE OF SAID HETERO-NITROGEN ATOMS BEING A QUATERNARY NITROGEN ATOM, IN THE PRESENCE OF A SILVER HALIDE DEVELOPER AND A SILVER HALIDE SOLVENT, SEPARATING THE LAYERS AND RECONTACTING THE SILVER HALIDE EMULSION LAYER WITH ANOTHER OF SAID RECEIVIG LAYERS IN THE PRESENCE OF SAID SILVER HALIDE DEVELOPER AND A SILVER HALIDE SOLVENT.
Claim 2
Dependent Claim
118 words
A PROCESS FOR OBTAINING MULTIPLE COPIES FROM AN EXPOSED SILVER HALIDE EMULSION LAYER, WHICH COMPRISES CONTACTING SAID EMULSION LAYER WITH A FIRST RECEIVING LAYER CONTAINING DEVELOPMENT NUCLEI, B BINDING AGENT AND A WATER-SOLUBLE BASIC POLYMERIC QUATERNARY SALT, SAID POLYMERIC QUATERNARY SALT HAVING A POLYVINYL CHAIN, EACH MONOMERIC UNIT OF WHICH IS LINKED DIRECTLY TO A FIVE TO SIX-MEMBERED HETEROCYCLIC NUCLEUS CONTAINING AS HETEROATOMS ONLY NITROGEN ATOMS, ONE OF SAID HETERO-NITROGEN ATOMS BEING A QUATERNARY NITROGEN ATOM, IN THE PRESENCE OF A SILVER HALIDE DEVELOPER AND A SILVER HALIDE SOLVENT, SEPARATING THE LAYERS AND RECONTACTING THE SILVER HALIDE EMULSION LAYER WITH ANOTHER OF SAID RECEIVIG LAYERS IN THE PRESENCE OF SAID SILVER HALIDE DEVELOPER AND A SILVER HALIDE SOLVENT.
References Cited (Backward Citations)
US2484420A
Cited
US2884057A
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US2834676A
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FR1166232A
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US3075841A
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US3017270A
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US2983606A
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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) | 1968-03-22 | 1968-09-21 | 1969-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-22 | 1972-09-21 | 1973-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-22 | 1976-09-21 | 1977-03-23 | $7700.00 | Window Closed / Lapsed |