US2843489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixed packet photographic emulsions with polyvinyl resin continuous phase
Assignee: Eastman Kodak Co
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Filing: 1955-07-29
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Granted: 1958-07-15
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Expires: 1975-07-29
Abstract
No abstract record available.
Inventors
- 👤 Ransford B Wilson
- 👤 William F Knechel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:48
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/28; G03C7/30; G03C7/388; G03C7/3882
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
THE METHOD OF MAKING A PACKET PHOTOGRAPHIC EMULSION WHICH COMPRISES ADDING AN EMULSION OF SILVER HALIDE IN PROTEIN MATERIAL TO A SOLUTION OF A WATER-PERMEABLE POLYVINYL RESIN, ADJUSTING THE PH OF THE MIXTURE APPROXIMATELY TO THE ISOELECTRIC POINT OF THE PROTEIN MATERIAL, THEREBY FORMING PACKETS OR PARTICLES OF THE PROTEIN MATERIAL IN THE RESIN, COOLING AND GELLING THE PACKET EMULSION, AND MIXING WITH THE EMULSION AT SOME STAGE IN THE PROCESS A DYEING MATERIAL SELECTED FROM THE CLASS CONSISTING OF BLEACHABLE DYES AND COLOR-FORMING COMPOUNDS CAPABLE OF COUPLING WITH THE OXIDATION PRODUCT OF PRIMARY AROMATIC AMINO DEVELOPERS.
Claim 2
Independent Claim
97 words
THE METHOD OF MAKING A PACKET PHOTOGRAPHIC EMULSION WHICH COMPRISES ADDING AN EMULSION OF SILVER HALIDE IN PROTEIN MATERIAL TO A SOLUTION OF A WATER-PERMEABLE POLYVINYL RESIN, ADJUSTING THE PH OF THE MIXTURE APPROXIMATELY TO THE ISOELECTRIC POINT OF THE PROTEIN MATERIAL, THEREBY FORMING PACKETS OR PARTICLES OF THE PROTEIN MATERIAL IN THE RESIN, COOLING AND GELLING THE PACKET EMULSION, AND MIXING WITH THE EMULSION AT SOME STAGE IN THE PROCESS A DYEING MATERIAL SELECTED FROM THE CLASS CONSISTING OF BLEACHABLE DYES AND COLOR-FORMING COMPOUNDS CAPABLE OF COUPLING WITH THE OXIDATION PRODUCT OF PRIMARY AROMATIC AMINO DEVELOPERS.
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) | 1961-07-14 | 1962-01-13 | 1962-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-14 | 1966-01-13 | 1966-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-14 | 1970-01-13 | 1970-07-15 | $7700.00 | Window Closed / Lapsed |