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Patent US2628167A successfully refreshed from Google Patents.
US2628167A
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Method of making colloid silver halide emulsions containing thallium
Assignee: EIDP Inc
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Filing: 1948-04-29
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Granted: 1953-02-10
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Expires: 1968-04-29
Abstract
No abstract record available.
Inventors
- 👤 Overman Joseph De Witt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:04
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
A METHOD OF MAKING A COLLOID SILVER HALIDE EMULSION WHICH COMPRISES ADDING TO AN AQUEOUS COLLOID SOLUTION A WATER-SOLUBLE SILVER SALT AND A WATER-SOLUBLE THALLOUS SALT, PRECIPITATING SILVER AND THALLOUSE HALIDES, RIPENDING THE RESULTING EMULSION AND PREPARING THE RIPENED EMULSION FOR COATEING, SAID WATER-SOLUBLE THALLOUSE SALT BEING USED IN AN AMOUNT OF 0.005 TO 0.05 MOL PER CENT BASED ON THE WATER-SOLUBLE SILVER SALT.
Claim 2
Independent Claim
64 words
A METHOD OF MAKING A COLLOID SILVER HALIDE EMULSION WHICH COMPRISES ADDING TO AN AQUEOUS COLLOID SOLUTION A WATER-SOLUBLE SILVER SALT AND A WATER-SOLUBLE THALLOUS SALT, PRECIPITATING SILVER AND THALLOUSE HALIDES, RIPENDING THE RESULTING EMULSION AND PREPARING THE RIPENED EMULSION FOR COATEING, SAID WATER-SOLUBLE THALLOUSE SALT BEING USED IN AN AMOUNT OF 0.005 TO 0.05 MOL PER CENT BASED ON THE WATER-SOLUBLE SILVER SALT.
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) | 1956-02-10 | 1956-08-11 | 1957-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-10 | 1960-08-11 | 1961-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-10 | 1964-08-11 | 1965-02-10 | $7700.00 | Window Closed / Lapsed |