US2743153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of hydrogen sulphide
Assignee: North Thames Gas Board
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Filing: 1951-09-29
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Granted: 1956-04-24
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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
2026-11-01 18:19
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: 1
Claim 1
Independent Claim
119 words
A PROCESS FOR PURIFYING HYDROGEN SULPHIDE CONCENTRATES WHICH CONTAIN FROM 8% TO 25% BY VOLUME OF HYDROGEN CYANIDE AND WHICH ARE OBTAINED FROM COAL GAS, WHICH PROCESS COMPRISES REMOVING AT LEAST 99% OF THE HYDROGEN CYANIDE 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 SULPHIDE CATALYST SELECTED FROM THE GROUP CONSISTING OF THE SULPHIDE OF TITANIUM, ZIRCONIUM, THORIUM AND CERIUM AND THEREAFTER REMOVING THE RESULTING AMMONIA FROM THE GASEOUS MIXTURE BY WASHING, THE THROUGHPUT OF GAS IN THE CATALYST BED BEING WITHIN THE RANGE OF 100 TO 1000 STANDARD CU FT. PER HOUR PER CU. FT. OF SPACE OCCUPIED BY THE CATALYST.
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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) | 1959-04-24 | 1959-10-24 | 1960-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-24 | 1963-10-24 | 1964-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-24 | 1967-10-24 | 1968-04-24 | $7700.00 | Window Closed / Lapsed |