US3679425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coagulation of aqueous polymeric dispersions of silver halide
Assignee: Eastman Kodak Co
•
Filing: 1970-08-03
•
Granted: 1972-07-25
•
Expires: 1990-08-03
Abstract
Abstract PROCESSES ARE DISCLOSED FOR COAGULATING AND REDISPERSING AQUEOUS DISPERSIONS OF POLYMERIC COMPOUNDS WHICH CONTAIN ANIONIC SULFOXY GROUPS THEREON. ENERALLY, THE POLYMERIC DISPERSION IS COAGULATED BY ADDING A POLYMERIC COMPOUND CONTAINING PRIMARY AMINE GROUPS THEREON AND PROVIDING A DILUTION RATIO OF A LEAST 100 GRAMS OF LIQUID PER GRAM OF POLYMER COMPRISING ANIONIC SULFOXY GROUPS. THE COAGULATED MATERIAL CAN THEN BE DECANTED AND EASILY REDISPERSED WITH LOW VOLUMES OF LIQUID.
Inventors
- 👤 Kenneth Robert Hollister
- 👤 Ernest John Perry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:51
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/053; C; C08; C08L; C08L33/00; C08L33/24; C08L33/26; C08L2201/00; C08L2201/50
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |