Patent US3677696A successfully refreshed from Google Patents.
US3677696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for removal and recovery of mercury from gases
Assignee: Outokumpu Oyj
•
Filing: 1971-05-07
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Granted: 1972-07-18
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Expires: 1991-05-07
Abstract
Abstract THE CONCENTRATION OF CIRCULATING SULPHURIC ACID IS ADJUSTED TO 80-98% BY WEIGHT AND USED TO WASH HOT GASES CONTAINING MERCURY. THE TEMPERATURE OF THE ACID IS MAINTAINED BETWEEN 70-250*C. AND THE SOLID MATERIAL SEPARATING FROM THE CIRCULATING WASH SOLUTION IS RECOVERED.
Inventors
- 👤 Petri Bryk
- 👤 Martti Haani
- 👤 Jorma B Honkasalo
- 👤 Jorma Kinnunen
- 👤 Olle Lindsjo
- 👤 Erik Nyholm
- 👤 Jaakko Poijarvi
- 👤 Jussi Rastas
- 👤 Juhani Kangas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:39
CPC Classifications
C; C22; C22B; C22B43/00; C01; C01G; C01G13/00; Y; Y02; Y02P; Y02P10/00; Y02P10/20
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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |