US2817580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for purifying hydrogen sulphide containing hydrogen cyanide
Assignee: North Thames Gas Board
•
Filing: 1951-09-29
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Granted: 1957-12-24
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Expires: 1971-09-29
Abstract
No abstract record available.
Inventors
- 👤 Marsh John David Francis
- 👤 Newling William Barry Savile
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:16
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/69; C01B17/74; C01B17/76; C01B17/16; C01B17/168; C01C; C01C3/00; C01C3/02; C01C3/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A PROCESS FOR PURIFYING HYDROGEN SULPHIDE CONTAINING HYDROGEN CYANIDE WHICH PROCESS COMPRISES REMOVING AT LEAST 99% OF THE HYDROGEN CYANIC PRESENT IN THE HYDROGEN SULPHIDE BY REACTING THE GAS WITH WATER VAPOR AT A TEMPERATURE BETWEEN 200* AND 400*C. IN THE PRESENCE OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF THE GAMMA FORM OF ALUMINUM METAHYDROXIDE AND THE GAMMA FORM OF ANHYDROUS ALUMINA AND THEREAFTER REMOV-VING THE RESULTING AMMONIA FROM THE GASEOUS MIXTURE BY WASHING.
Claim 2
Dependent Claim
76 words
A PROCESS FOR PURIFYING HYDROGEN SULPHIDE CONTAINING HYDROGEN CYANIDE WHICH PROCESS COMPRISES REMOVING AT LEAST 99% OF THE HYDROGEN CYANIC PRESENT IN THE HYDROGEN SULPHIDE BY REACTING THE GAS WITH WATER VAPOR AT A TEMPERATURE BETWEEN 200* AND 400*C. IN THE PRESENCE OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF THE GAMMA FORM OF ALUMINUM METAHYDROXIDE AND THE GAMMA FORM OF ANHYDROUS ALUMINA AND THEREAFTER REMOV-VING THE RESULTING AMMONIA FROM THE GASEOUS MIXTURE BY WASHING.
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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) | 1960-12-23 | 1961-06-24 | 1961-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-23 | 1965-06-24 | 1965-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-23 | 1969-06-24 | 1969-12-24 | $7700.00 | Window Closed / Lapsed |