US3241969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic silver halide emulsions
Assignee: Individual
•
Filing: 1962-01-29
•
Granted: 1966-03-22
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Expires: 1982-01-29
Abstract
No abstract record available.
Inventors
- 👤 Hart Rene Maurice
- 👤 Wilrijk-Antwerp
- 👤 Vrancken Marcel Nicolas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:09
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/015; C; C08; C08F; C08F8/00; C08F8/12; C08F8/34; C08F8/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A METHOD FOR REMOVING WATER-SOLUBLE SALTS FROM AQUEOUS GELATINO SILVER HALIDE DISPERSIONS WHICH COMPRISES ADDING TO AN AQUEOUS GELATINO SILVER HALIDE DISPERSION AN AQUEOUS SOLUTION OF A POLYMER FROM THE GROUP CONSISTING OF POLYMERS BEARING SULFONIC ACID SIDE-GROUPS AND SALTS THEREOF, ADJUSTING THE PH TO A PRECIPITATING PH WITHIN THE RANGE OF 2-5 TO CAUSE PERCIPITATION OF THE GELATIN TOGETHER WITH THE DISPERSED SILVER HALIDE, AND DECANTING THE SUPERNATANT AQUEOUS SOLUTION CONTAINING THE WATER-SOLUBLE SALTS, SAID POLYMER BEARING SULFONIC ACID SIDE-GROUPS COMPRISING IN ITS MOLECULAR STRUCTURE RECURRING STRUCTURAL UNITS OF AT LEAST ONE OF THE FOLLOWING FORMULAE:
Claim 2
Independent Claim
97 words
A METHOD FOR REMOVING WATER-SOLUBLE SALTS FROM AQUEOUS GELATINO SILVER HALIDE DISPERSIONS WHICH COMPRISES ADDING TO AN AQUEOUS GELATINO SILVER HALIDE DISPERSION AN AQUEOUS SOLUTION OF A POLYMER FROM THE GROUP CONSISTING OF POLYMERS BEARING SULFONIC ACID SIDE-GROUPS AND SALTS THEREOF, ADJUSTING THE PH TO A PRECIPITATING PH WITHIN THE RANGE OF 2-5 TO CAUSE PERCIPITATION OF THE GELATIN TOGETHER WITH THE DISPERSED SILVER HALIDE, AND DECANTING THE SUPERNATANT AQUEOUS SOLUTION CONTAINING THE WATER-SOLUBLE SALTS, SAID POLYMER BEARING SULFONIC ACID SIDE-GROUPS COMPRISING IN ITS MOLECULAR STRUCTURE RECURRING STRUCTURAL UNITS OF AT LEAST ONE OF THE FOLLOWING FORMULAE:
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) | 1969-03-21 | 1969-09-20 | 1970-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-21 | 1973-09-20 | 1974-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-21 | 1977-09-20 | 1978-03-22 | $7700.00 | Window Closed / Lapsed |