Patent US1593709A successfully refreshed from Google Patents.
Patent US3326641A successfully refreshed from Google Patents.
US3326641A
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Fractional separation of silver halide grains
Assignee: Eastman Kodak Co
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Filing: 1964-02-12
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Granted: 1967-06-20
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Expires: 1984-02-12
Abstract
No abstract record available.
Inventors
- 👤 Roger G Audran
- 👤 Gibert Michel
- 👤 Andre H Rolland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:27
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/015; G03C2200/00; G03C2200/09
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A METHOD OF TREATINGD AN AQUEOUS DISPERSION OF SILVER HALIDE GRAINS IN THE PROCESS OF RIPENING WHICH COMPRISES, INTRODUCING REAGENTS INTO A FIRST VESSEL TO FORM AN AQUEOUS DISPERSION OF SILVER HALIDE GRAINS, RUNNING THE DISPERSION UNDER PRESSURE INTO A HYDROCYCLONE SEPARATOR WHEREBY THE DISPERSION IS SUBJECTED TO CENTRIFUGAL FORCE IN A ZONE OF THE SEPARATOR, WHEREIN SILVER HALIDE CRYSTALS ARE FURTHER RIPENED TO A SELECTED LARGE SIZE WITHDRAWING THE LARGER SILVER HALIDE GRAINSD FROM THE SEPARATOR AS THEY ARE FORMED, WITHDRAWING AND RETURNING THE SMALL UNDEVELOPED GRAINS TO SAID REAGENT VESSEL FOR MINGLING WITH THE FRESH AMOUNT OF DISPERSION FORMED BY THE INTRODUCTION OF REAGENTS THEREIN.
Claim 2
Independent Claim
107 words
A METHOD OF TREATINGD AN AQUEOUS DISPERSION OF SILVER HALIDE GRAINS IN THE PROCESS OF RIPENING WHICH COMPRISES, INTRODUCING REAGENTS INTO A FIRST VESSEL TO FORM AN AQUEOUS DISPERSION OF SILVER HALIDE GRAINS, RUNNING THE DISPERSION UNDER PRESSURE INTO A HYDROCYCLONE SEPARATOR WHEREBY THE DISPERSION IS SUBJECTED TO CENTRIFUGAL FORCE IN A ZONE OF THE SEPARATOR, WHEREIN SILVER HALIDE CRYSTALS ARE FURTHER RIPENED TO A SELECTED LARGE SIZE WITHDRAWING THE LARGER SILVER HALIDE GRAINSD FROM THE SEPARATOR AS THEY ARE FORMED, WITHDRAWING AND RETURNING THE SMALL UNDEVELOPED GRAINS TO SAID REAGENT VESSEL FOR MINGLING WITH THE FRESH AMOUNT OF DISPERSION FORMED BY THE INTRODUCTION OF REAGENTS THEREIN.
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) | 1970-06-19 | 1970-12-19 | 1971-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-19 | 1974-12-19 | 1975-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-19 | 1978-12-19 | 1979-06-20 | $7700.00 | Window Closed / Lapsed |