Patent US3554883A successfully refreshed from Google Patents.
US3554883A
Expired / Lapsed
US
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Method of purifying aqueous silver nitrate solutions
Assignee: Eastman Kodak Co
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Filing: 1968-06-06
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Granted: 1971-01-12
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Expires: 1988-06-06
Abstract
Abstract AQUEOUS ILVER NITRATE SOLUTIONS, SUCH AS ARE PREPARED BY DISSOLVING SILVER BULLION IN NITRIC ACID OR RECOVERED FROM THE ELECTROLYTIC CELL IN ELECTROEFINING OF SILVER, ARE TREATED TO REMOVE A MAJOR PROPORTION OF METAL CONTAMINANTS THEREFROM, WITH MINIMUM LOSS OF SILVER, BY SUCCESSIVE ADDITIOSN OF SILVER OXIDE TO INCREASE THE PH AND THEREBY PRECIPITATE THE METAL CONTAIMINANTS WHICH ARE REMOVED AFTER EACH PRECIPITATION.
Inventors
- 👤 Gerald R Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:54
CPC Classifications
C; C01; C01G; C01G5/00
Claims Analysis
Total Claims: 0
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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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |