US3000739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing silver halide emulsions
Assignee: EIDP Inc
•
Filing: 1957-04-02
•
Granted: 1961-09-19
•
Expires: 1977-04-02
Abstract
No abstract record available.
Inventors
- 👤 Maffet Vere
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:49
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/015
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A PROCESS FOR IMPROVING THE LOW INTENSITY RESPONSE OF A LIGHT-SENSITIVE SILVER HALIDE DISPERSION HAVING A PAG FROM 6.5 TO 8.75 IN A WATER-PERMEABLE ORGANIC COLLOID THAT HAS BEEN RIPENED AND DIGESTED AT A TEMPERATURE FROM ABOUT 110*F. TO 180*F. FOR 35 TO 70 MINUTES WHICH COMPRISES (1) ADJUSTING THE PAG OF THE PRECIPITATED RIPENED AND DIGESTED AQUEOUS DISPERSION UPWARDLY BY 0.2 TO 2.0 PAG UNITS BY THE ADDITION OF A WATER-SOLUBLE INORGANIC HALIDE TAKEN FROM THE GROUP CONSISTING OF HYDROGEN AMMONIUM, LITHIUM, SODIUM, POTASSIUM AND CADMIUM CHLORIDE AND BROMIDE AND (2) SUBJECTING THE RESULTING DISPERSION TO AN AUXILLARY DIGESTION AT A TEMPERATURE OF 110*F. TO 200*F. FOR A PERIOD OF ABOUT 3 TO ABOUT 30 MINUTES PRIOR TO COATING.
Claim 2
Dependent Claim
120 words
A PROCESS FOR IMPROVING THE LOW INTENSITY RESPONSE OF A LIGHT-SENSITIVE SILVER HALIDE DISPERSION HAVING A PAG FROM 6.5 TO 8.75 IN A WATER-PERMEABLE ORGANIC COLLOID THAT HAS BEEN RIPENED AND DIGESTED AT A TEMPERATURE FROM ABOUT 110*F. TO 180*F. FOR 35 TO 70 MINUTES WHICH COMPRISES (1) ADJUSTING THE PAG OF THE PRECIPITATED RIPENED AND DIGESTED AQUEOUS DISPERSION UPWARDLY BY 0.2 TO 2.0 PAG UNITS BY THE ADDITION OF A WATER-SOLUBLE INORGANIC HALIDE TAKEN FROM THE GROUP CONSISTING OF HYDROGEN AMMONIUM, LITHIUM, SODIUM, POTASSIUM AND CADMIUM CHLORIDE AND BROMIDE AND (2) SUBJECTING THE RESULTING DISPERSION TO AN AUXILLARY DIGESTION AT A TEMPERATURE OF 110*F. TO 200*F. FOR A PERIOD OF ABOUT 3 TO ABOUT 30 MINUTES PRIOR TO COATING.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-18 | 1965-03-20 | 1965-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-18 | 1969-03-20 | 1969-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-18 | 1973-03-20 | 1973-09-19 | $7700.00 | Window Closed / Lapsed |