Patent US3433634A successfully refreshed from Google Patents.
US3433634A
Expired / Lapsed
US
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Diffusion transfer process
Assignee: Gevaert Photo Producten NV
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Filing: 1964-02-05
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Granted: 1969-03-18
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Expires: 1984-02-05
Abstract
No abstract record available.
Inventors
- 👤 Louis Maria De Haes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:58
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/04; G03C8/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A PROCESS FOR OBTAINING PHOTOGRAPHIC IMAGES ACCORDING TO THE SILVER HALIDE DIFFUSION TRANSFER PROCESS, WHICH COMPRISES: IMAGE-WISE EXPOSING A LIGHT SENSITIVE MATERIAL, (A) COMPRISING A SUPPORT, A LIGHT-SENSITIVE SILVER HALIDE EMULSION LAYER AND A LAYER OF A SWELLABLE COLLOID ON TOP OF SAID LIGHT-SENSITIVE LAYER, AND (B) CONTAINING HYDROQUINONE AND A 3-PYRAZOLIDONE DEVELOPING COMPOUND, CONTACTING SAID LIGHT-SENSITIVE MATERIAL, IN THE PRESENCE OF AN ALKALINE TREATING LIQUID WHICH IS SUBSTANTIALLY FREE OF DEVELOPING AGENTS, WITH AN IMAGE-RECEIVING MATERIAL CONTAINING HYDROQUINONE AND A MEMBER SELECTED FROM THE GROUP CONSISTING OF DEVELOPMENT NUCLEI AND SUBSTANCES CAPABLE OF FORMING SUCH NUCLEI IN SITU, AND SEPARATING THE CONTACTED MATERIALS FROM EACH OTHER.
Claim 2
Dependent Claim
107 words
A PROCESS FOR OBTAINING PHOTOGRAPHIC IMAGES ACCORDING TO THE SILVER HALIDE DIFFUSION TRANSFER PROCESS, WHICH COMPRISES: IMAGE-WISE EXPOSING A LIGHT SENSITIVE MATERIAL, (A) COMPRISING A SUPPORT, A LIGHT-SENSITIVE SILVER HALIDE EMULSION LAYER AND A LAYER OF A SWELLABLE COLLOID ON TOP OF SAID LIGHT-SENSITIVE LAYER, AND (B) CONTAINING HYDROQUINONE AND A 3-PYRAZOLIDONE DEVELOPING COMPOUND, CONTACTING SAID LIGHT-SENSITIVE MATERIAL, IN THE PRESENCE OF AN ALKALINE TREATING LIQUID WHICH IS SUBSTANTIALLY FREE OF DEVELOPING AGENTS, WITH AN IMAGE-RECEIVING MATERIAL CONTAINING HYDROQUINONE AND A MEMBER SELECTED FROM THE GROUP CONSISTING OF DEVELOPMENT NUCLEI AND SUBSTANCES CAPABLE OF FORMING SUCH NUCLEI IN SITU, AND SEPARATING THE CONTACTED MATERIALS FROM EACH OTHER.
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) | 1972-03-17 | 1972-09-16 | 1973-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-17 | 1976-09-16 | 1977-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-17 | 1980-09-16 | 1981-03-18 | $7700.00 | Window Closed / Lapsed |