Patent US3345166A successfully refreshed from Google Patents.
US3345166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic process whereby a fully developed and fixed negative is formed concurrently with a positive silver transfer image
Assignee: Polaroid Corp
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Filing: 1961-03-09
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Granted: 1967-10-03
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Expires: 1981-03-09
Abstract
No abstract record available.
Inventors
- 👤 Edwin H Land
- 👤 Meroe M Morse
- 👤 Elizabeth L Yankowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:54
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/38; G03C5/383; G03C8/00; G03C8/02; G03C8/04; G03C8/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
245 words
A PROCESS OF FORMING A FULLY DEVELOPED AND FIXED OUT NEGATIVE CONCURRENTLY WITH THE FORMATION OF A SILVER TRANSFER IMAGE COMPRISING DEVELOPING AN EXPOSED SILVER HALIDE EMULSION LAYER, SAID EMULSION BEING A SILVER IODOBROMIDE EMULSION THE GRAINS OF WHICH HAVE AN AVERAGE DIAMETER OF APPROXIMATELY 1 TO 2U, WITH A PROCESSING FLUID INCLUDING AN ALKALI, A SILVER HALIDE DEVELOPING AGENT, A VISCOSITY-INCREASING, FILM-FORMING REAGENT, SAID FILM-FORMING REAGENT BEING SELECTED FROM THE GROUP CONSISTING OF SODIUM CARBOXYMETHYL CELLULOSE AND HYDROXYETHYL CELLULOSE, AND A SILVER HALIDE SOLVENT CAPABLE OF FORMING WATER-SOLUBLE COMPLEXES WITH UNEXPOSED AND UNDEVELOPED SILVER HALIDE, SAID SILVER HALIDE SOLVENT BEING PRESENT IN A CONCENTRATION, BY WEIGHT, IN EXCESS OF THE CONCENTRATION OF SAID ALKALI, SAID SILVER HALIDE SOLVENT BEING PRESENT IN A CONCENTRATION APPROXIMATELY AT LEAST 4 TIMES THAT CONCENTRATION NECESSARY TO OBTAIN A SILVER TRANSFER IMAGE HAVING A MAXIMUM DENSITY IN EXCESS OF 1.0 IN 1 MINUTE WITH THE SAME SILVER HALIDE EMULSION LAYER, FORMING AN IMAGEWISE DISTRIBUTION OF SAID SOLUBLE SILVER COMPLEX IN UNDEVELOPED AREAS, TRANSFERRING SAID SOLUBLE SILVER COMPLEX TO A SUPERPOSED IMAGE-RECEIVING LAYER TO FORM A POSITIVE SILVER TRANSFER IMAGE AND SEPARATING SAID IMAGE-RECEIVING LAYER AND SAID SILVER HALIDE EMULSION LAYER, SAID SEPARATED SILVER HALIDE EMULSION LAYER BEING INSENSITIVE TO FURTHER ACTINIC RADIATION AND CONTAINING A FULLY DEVELOPED AND FIXED OUT NEGATIVE IMAGE, THE SILVER OF SAID NEGATIVE AND POSITIVE IMAGES HAVING HIGH COVERING POWER AND SAID NEGATIVE THE POSITIVE IMAGES EACH HAVING A MAXIMUM DENSITY IN EXCESS OF 1.0.
Claim 2
Dependent Claim
245 words
A PROCESS OF FORMING A FULLY DEVELOPED AND FIXED OUT NEGATIVE CONCURRENTLY WITH THE FORMATION OF A SILVER TRANSFER IMAGE COMPRISING DEVELOPING AN EXPOSED SILVER HALIDE EMULSION LAYER, SAID EMULSION BEING A SILVER IODOBROMIDE EMULSION THE GRAINS OF WHICH HAVE AN AVERAGE DIAMETER OF APPROXIMATELY 1 TO 2U, WITH A PROCESSING FLUID INCLUDING AN ALKALI, A SILVER HALIDE DEVELOPING AGENT, A VISCOSITY-INCREASING, FILM-FORMING REAGENT, SAID FILM-FORMING REAGENT BEING SELECTED FROM THE GROUP CONSISTING OF SODIUM CARBOXYMETHYL CELLULOSE AND HYDROXYETHYL CELLULOSE, AND A SILVER HALIDE SOLVENT CAPABLE OF FORMING WATER-SOLUBLE COMPLEXES WITH UNEXPOSED AND UNDEVELOPED SILVER HALIDE, SAID SILVER HALIDE SOLVENT BEING PRESENT IN A CONCENTRATION, BY WEIGHT, IN EXCESS OF THE CONCENTRATION OF SAID ALKALI, SAID SILVER HALIDE SOLVENT BEING PRESENT IN A CONCENTRATION APPROXIMATELY AT LEAST 4 TIMES THAT CONCENTRATION NECESSARY TO OBTAIN A SILVER TRANSFER IMAGE HAVING A MAXIMUM DENSITY IN EXCESS OF 1.0 IN 1 MINUTE WITH THE SAME SILVER HALIDE EMULSION LAYER, FORMING AN IMAGEWISE DISTRIBUTION OF SAID SOLUBLE SILVER COMPLEX IN UNDEVELOPED AREAS, TRANSFERRING SAID SOLUBLE SILVER COMPLEX TO A SUPERPOSED IMAGE-RECEIVING LAYER TO FORM A POSITIVE SILVER TRANSFER IMAGE AND SEPARATING SAID IMAGE-RECEIVING LAYER AND SAID SILVER HALIDE EMULSION LAYER, SAID SEPARATED SILVER HALIDE EMULSION LAYER BEING INSENSITIVE TO FURTHER ACTINIC RADIATION AND CONTAINING A FULLY DEVELOPED AND FIXED OUT NEGATIVE IMAGE, THE SILVER OF SAID NEGATIVE AND POSITIVE IMAGES HAVING HIGH COVERING POWER AND SAID NEGATIVE THE POSITIVE IMAGES EACH HAVING A MAXIMUM DENSITY IN EXCESS OF 1.0.
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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) | 1970-10-02 | 1971-04-03 | 1971-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-02 | 1975-04-03 | 1975-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-02 | 1979-04-03 | 1979-10-03 | $7700.00 | Window Closed / Lapsed |