US2688601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of silver dispersions
Assignee: Eastman Kodak Co
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Filing: 1951-09-27
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Granted: 1954-09-07
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Expires: 1971-09-27
Abstract
No abstract record available.
Inventors
- 👤 Arthur H Herz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:32
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/825; G03C1/8255
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A METHOD OF PREPARING A STABLE DISPERSION OF SILVER COMPRISING SUBJECTING AN AQUEOUS GELATIN SOLUTION OF A MIXTURE OF A WATER-SOLUBLE SILVER SALT, AT LEAST ONE-HALF MOLECULAR EQUIVALENT OF AN ALKALIE METAL SULFITE, BASED ON THE SILVER SALT, AND AT LEAST ABOUT 0.0017 MOL OF A WATER-SOLUBLE CALCIUM SALT PER LITER OF REACTION MIXTURE, TO THE ACTION OF AN EXCESS OF A SILVER SALT REDUCING AGENT WITHIN APPROXIMATELY ONE MINUTE OF MIXING SAID SILVER SALT AND ALKALI METAL SULFITE.
Claim 2
Independent Claim
79 words
A METHOD OF PREPARING A STABLE DISPERSION OF SILVER COMPRISING SUBJECTING AN AQUEOUS GELATIN SOLUTION OF A MIXTURE OF A WATER-SOLUBLE SILVER SALT, AT LEAST ONE-HALF MOLECULAR EQUIVALENT OF AN ALKALIE METAL SULFITE, BASED ON THE SILVER SALT, AND AT LEAST ABOUT 0.0017 MOL OF A WATER-SOLUBLE CALCIUM SALT PER LITER OF REACTION MIXTURE, TO THE ACTION OF AN EXCESS OF A SILVER SALT REDUCING AGENT WITHIN APPROXIMATELY ONE MINUTE OF MIXING SAID SILVER SALT AND ALKALI METAL SULFITE.
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) | 1957-09-06 | 1958-03-08 | 1958-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-06 | 1962-03-08 | 1962-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-06 | 1966-03-08 | 1966-09-07 | $7700.00 | Window Closed / Lapsed |