US3218169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing photographic emulsions
Assignee: Polaroid Corp
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Filing: 1961-06-19
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Granted: 1965-11-16
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Expires: 1981-06-19
Abstract
No abstract record available.
Inventors
- 👤 Jr Walter D Kelly
- 👤 Peter H Roth
- 👤 Lloyd D Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:07
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A METHOD OF PREPARING SILVER HALIDE DISPERSIONS WHICH COMPRISES THE STEPS OF MIXING TOGETHER A WATERSOLUBLE SILVER SALT AND AT LEASST ONE SOLUBLE HALIDE IN AN AQUEOUS SOLUTION OF A GELATIN PEPTIZING COLLOID, THEREBY FORMING A SILVER HALIDE-GELATIN DISPERSION, ADDIDDNG A WATERSOLUBLE POLYMER SELECTED FROM THE GROUP CONSISTING OF POLYVINYL OXAZINES, POLYVINYL OZAZOLINES, POLYVINYL OXAZOLIDINONES AND POLYVINYL PYRROLIDONES TO SAID SILVER HALIDE DISPERSION IN GELATIN AND COAGULATING THE MIXTURE BY ADDING A HYDROGEN BONDING AGENT SELECTED FROM THE GROUP CONSISTING OF PHENOLS, RESORCINOLS, AROMATIC ACIDS, AMINES, MERCAPTOTHIAZOLES, PHLOROGLUCINOLS AND THIOCARBANILIDES, WHEREBY A WATER-INSOLUBLE REACTION PRODUCT OF SAID WATER-SOLUBLE POLYMER AND SAID HYDROGEN BONDING AGENT IS FORMED, SEPARATING THE RESULTING PERCIPITATE FROM THE LIQUID PORTION OF THE MASS, AND WASHING THE SEPARATED PRECIPITATE WITH A COLD WATER WASH, THEREBY RENDERING IT SUBSTANTIALLY FREE OF SAID REACTION PRODUCT OF SAID POLYMER AND SAID HYDROGEN BONDING AGENT.
Claim 2
Independent Claim
144 words
A METHOD OF PREPARING SILVER HALIDE DISPERSIONS WHICH COMPRISES THE STEPS OF MIXING TOGETHER A WATERSOLUBLE SILVER SALT AND AT LEASST ONE SOLUBLE HALIDE IN AN AQUEOUS SOLUTION OF A GELATIN PEPTIZING COLLOID, THEREBY FORMING A SILVER HALIDE-GELATIN DISPERSION, ADDIDDNG A WATERSOLUBLE POLYMER SELECTED FROM THE GROUP CONSISTING OF POLYVINYL OXAZINES, POLYVINYL OZAZOLINES, POLYVINYL OXAZOLIDINONES AND POLYVINYL PYRROLIDONES TO SAID SILVER HALIDE DISPERSION IN GELATIN AND COAGULATING THE MIXTURE BY ADDING A HYDROGEN BONDING AGENT SELECTED FROM THE GROUP CONSISTING OF PHENOLS, RESORCINOLS, AROMATIC ACIDS, AMINES, MERCAPTOTHIAZOLES, PHLOROGLUCINOLS AND THIOCARBANILIDES, WHEREBY A WATER-INSOLUBLE REACTION PRODUCT OF SAID WATER-SOLUBLE POLYMER AND SAID HYDROGEN BONDING AGENT IS FORMED, SEPARATING THE RESULTING PERCIPITATE FROM THE LIQUID PORTION OF THE MASS, AND WASHING THE SEPARATED PRECIPITATE WITH A COLD WATER WASH, THEREBY RENDERING IT SUBSTANTIALLY FREE OF SAID REACTION PRODUCT OF SAID POLYMER AND SAID HYDROGEN BONDING AGENT.
References Cited (Backward Citations)
US2495918A
Cited
US3043697A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |