US2784055A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the treatment of gases rich in hydrogen sulphide
Assignee: North Thames Gas Board
•
Filing: 1952-04-28
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Granted: 1957-03-05
•
Expires: 1972-04-28
Abstract
No abstract record available.
Inventors
- 👤 Silver Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:23
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/16; C01B17/168
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
80 words
A MULTIPLE STAGE PROCESS FOR REMOVING AMMONIA FROM GASES CONTAINING HYDROGEN SULPHITE, AMMONIA AND CARBON DIOXIDE COMPRISING THE STEPS OF WASHING THE GASES WITH WATER, HOLDING THE RESULTING AQUEOUS LIQUOR UNTIL SUBSTANTIAL COMBINATION OF THE CARBON DIOXIDE AND AMMONIA HAS OCCURED AND THEREAFTER PASSING AN INERT CARRIER GAS IN AN AMOUNT UP TO ABOUT 50% BY VOLUME OF THE TREATED GAS THROUGH THE AQUEOUS WASH LIQUOR AND THEREAFTER COMBINING THE INERT CARRIER GAS WITH THE GASES ENTERING THE WASHING STEP.
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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) | 1960-03-04 | 1960-09-03 | 1961-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-04 | 1964-09-03 | 1965-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-04 | 1968-09-03 | 1969-03-05 | $7700.00 | Window Closed / Lapsed |