US2565418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing photographic silver halide emulsions
Assignee: Eastman Kodak Co
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Filing: 1947-08-13
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Granted: 1951-08-21
•
Expires: 1967-08-13
Abstract
No abstract record available.
Inventors
- 👤 Edward C Yackel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:55
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A METHOD OF PREPARING ACID COAGULABLE SILVER-HALIDE DISPERSIONS OF LOW WATER SOLUBLE SALT CONTENT WHICH COMPRISES PREPARING SILVER-HALIDE IN AN AQUEOUS SOLUTION OF A SILVER-HALIDE DISPERSING AGENT, MIXING THEREWITH 1/3-1 PART OF AN ALKALINE-SOLUBLE, ACID-INSOLUBLE ORGANIC RESIN CONTAINING CARBOXYL GROUPS, PER PART OF SILVER-HALIDE DISPERSING AGENT, ADDING ACID TO REDUCE THE PH TO 4-5.5 WHEREBY GRAINS TO SILVER-HALIDE ENVELOPED BY THE DISPERSING AGENT AND THE RESIN FORM, SEPARATING THE LIQUID THEREFROM, AND REDISPERSING IN WATER AT A PH ABOVE 6.5
Claim 2
Independent Claim
80 words
A METHOD OF PREPARING ACID COAGULABLE SILVER-HALIDE DISPERSIONS OF LOW WATER SOLUBLE SALT CONTENT WHICH COMPRISES PREPARING SILVER-HALIDE IN AN AQUEOUS SOLUTION OF A SILVER-HALIDE DISPERSING AGENT, MIXING THEREWITH 1/3-1 PART OF AN ALKALINE-SOLUBLE, ACID-INSOLUBLE ORGANIC RESIN CONTAINING CARBOXYL GROUPS, PER PART OF SILVER-HALIDE DISPERSING AGENT, ADDING ACID TO REDUCE THE PH TO 4-5.5 WHEREBY GRAINS TO SILVER-HALIDE ENVELOPED BY THE DISPERSING AGENT AND THE RESIN FORM, SEPARATING THE LIQUID THEREFROM, AND REDISPERSING IN WATER AT A PH ABOVE 6.5
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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) | 1954-08-20 | 1955-02-19 | 1955-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-20 | 1959-02-19 | 1959-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-20 | 1963-02-19 | 1963-08-21 | $7700.00 | Window Closed / Lapsed |