Patent US2940828A successfully refreshed from Google Patents.
US2940828A
Expired / Lapsed
US
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Purification of silver nitrate solutions
Assignee: EIDP Inc
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Filing: 1957-10-29
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Granted: 1960-06-14
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Expires: 1977-10-29
Abstract
No abstract record available.
Inventors
- 👤 Moede Jerome Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:38
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/015; C; C01; C01G; C01G5/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A PROCESS OF PURIFYING AN AQUEOUS SOLUTION OF SILVER NITRATE CONTAINING SMALL AMOUNTS OF HEAVY METAL AND NOBLE METAL IMPURITIES WHICH CONSISTS OF TREATING SAID SOLUTION WITH SILVER OXIDE TO ATTAIN A PH OF AT LEAST 6.1, EXPOSING SAID SOLUTION TO ULTRAVIOLET RADIATION HAVING A WAVELENGTH WITHIN THE RANGE OF ABOUT 1850 TO ABOUT 3800 ANGSTROMS IN AN AMOUNT OF FROM ABOUT 100 TO ABOUT 1750 MICEOWATT HOURS OF ULTRAVIOLET RADIATION PER GRAM OF SILVER NITRATE TREATED, SEPARATING THE SILVER NITRATE SOLUTION FROM THE PRECIPITATE, AND PASSING THE RESULTING SOLUTION INTO CONTACT WITH AT LEAST ONE WATER-INSOLUBLE POROUS SOLID ADSORBENT TAKEN FROM THE GROUP CONSISTING OF ALUMINA AND MAGNESIA.
Claim 2
Dependent Claim
109 words
A PROCESS OF PURIFYING AN AQUEOUS SOLUTION OF SILVER NITRATE CONTAINING SMALL AMOUNTS OF HEAVY METAL AND NOBLE METAL IMPURITIES WHICH CONSISTS OF TREATING SAID SOLUTION WITH SILVER OXIDE TO ATTAIN A PH OF AT LEAST 6.1, EXPOSING SAID SOLUTION TO ULTRAVIOLET RADIATION HAVING A WAVELENGTH WITHIN THE RANGE OF ABOUT 1850 TO ABOUT 3800 ANGSTROMS IN AN AMOUNT OF FROM ABOUT 100 TO ABOUT 1750 MICEOWATT HOURS OF ULTRAVIOLET RADIATION PER GRAM OF SILVER NITRATE TREATED, SEPARATING THE SILVER NITRATE SOLUTION FROM THE PRECIPITATE, AND PASSING THE RESULTING SOLUTION INTO CONTACT WITH AT LEAST ONE WATER-INSOLUBLE POROUS SOLID ADSORBENT TAKEN FROM THE GROUP CONSISTING OF ALUMINA AND MAGNESIA.
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) | 1963-06-14 | 1963-12-14 | 1964-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-14 | 1967-12-14 | 1968-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-14 | 1971-12-14 | 1972-06-14 | $7700.00 | Window Closed / Lapsed |