US2846305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation and recovery of mercury
Assignee: Wyeth Holdings LLC
•
Filing: 1954-04-05
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Granted: 1958-08-05
•
Expires: 1974-04-05
Abstract
No abstract record available.
Inventors
- 👤 Kenneth D Ashley
- 👤 Malden W Michael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:13
CPC Classifications
C; C22; C22B; C22B43/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A METHOD OF SEPARATING MERCURY FROM ALUMINAAND MERCURY-CONTAINING SLUDGES ARISING INT HE PRODUCTION OF ALUMINA CATALYSTS SAID SLUDGES CONTAINING MINOR AMOUNTS OF MERCURY OF THE ORDER OF ABOUT 0.5 O ABOUT 5% WHICH COMPRISES TREATING THE SLUDGE CONTAINING ALUMINA AND FINE COLLOIDAL MERCURY WITH SULFURIC ACID HAVING A CONCENTRATION OF FROM ABOUT 10% TO ABOUT 80% TO DISSOLVE THE ALUMINA AND FORM AN ALUMINUM SULFATE SOLUTION, SEPARATING THE MERCURY FROM SAID SOLUTION, AND SULFIDING THE ALUMINUM SULFATE SOLUTION WITH HYDROGEN SULFIDE AND FILTERING IT TO REDUCE STILL FURTHER THE CONCENTRATION OF MERCURY THEREIN.
Claim 2
Independent Claim
93 words
A METHOD OF SEPARATING MERCURY FROM ALUMINAAND MERCURY-CONTAINING SLUDGES ARISING INT HE PRODUCTION OF ALUMINA CATALYSTS SAID SLUDGES CONTAINING MINOR AMOUNTS OF MERCURY OF THE ORDER OF ABOUT 0.5 O ABOUT 5% WHICH COMPRISES TREATING THE SLUDGE CONTAINING ALUMINA AND FINE COLLOIDAL MERCURY WITH SULFURIC ACID HAVING A CONCENTRATION OF FROM ABOUT 10% TO ABOUT 80% TO DISSOLVE THE ALUMINA AND FORM AN ALUMINUM SULFATE SOLUTION, SEPARATING THE MERCURY FROM SAID SOLUTION, AND SULFIDING THE ALUMINUM SULFATE SOLUTION WITH HYDROGEN SULFIDE AND FILTERING IT TO REDUCE STILL FURTHER THE CONCENTRATION OF MERCURY THEREIN.
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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) | 1961-08-04 | 1962-02-03 | 1962-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-04 | 1966-02-03 | 1966-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-04 | 1970-02-03 | 1970-08-05 | $7700.00 | Window Closed / Lapsed |