US2687947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of sulfur dioxide
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1951-03-21
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Granted: 1954-08-31
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Expires: 1971-03-21
Abstract
No abstract record available.
Inventors
- 👤 Manning John
- 👤 Maclennan William Hector
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:15
CPC Classifications
A; A47; A47J; A47J43/00; A47J43/04; A47J43/07; A47J43/08; A47J43/082; C; C01; C01B; C01B17/00; C01B17/48; C01B17/50; C01B17/501; C01B17/506; C04; C04B; C04B7/00; C04B7/02; C04B7/04; F; F16; F16H; F16H55/00; F16H55/32; F16H55/52; F16H55/56; F16H55/566
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A CONTINUOUS PROCESS FOR THE PRODUCTION OF SULPHUR DIOXIDE WHICH COMPIRSES CHARGING TO THE CARS OF A MUFFLED CONTINOUS TUNNEL KILN AT ITS INLET A MIXTURE OF SOLIDS CONTAINING CALCIUM SULPHATE, CARBONACEOUS MATERIAL AND SILICA, APPLYING HEAT EXTERNALLY TO THE MUFFLES OF THE KILN AND PROGRESSING THE CARS CONTINUOUSLY THROUGH THE KILN SO THAT THE MIXTURE CHARGED THEREON IS INDIRECTLY HEATED WITHIN THE KILN FROM THE TEMPERATURE AT WHICH IT IS CHARGED TO THE CARS TO A TEMPERATURE WITHIN THE RANGE OF 900* C. TO 1400* C., THE SAID INDIRECT HEATING TAKING PLACE IN THE ABSENCE OF ADDED OXYGEN FOR SUFFICIENT TIME TO INSURE SUBSTANTIAL REACTION OF THE COMPONENTS OF THE MIXTURE, CONTINUOUSLY WITHDRAWING CAR WITH REACTED SOLID RESIDUE AT THE OUTLET OF SAID TUNNEL KILN AND RECOVERING A GASEOUS MIXTURE RICH IN SULPHUR DIOXIDE FROM THE SPACE IN THE KILN ABOVE THE CARS.
Claim 2
Dependent Claim
144 words
A CONTINUOUS PROCESS FOR THE PRODUCTION OF SULPHUR DIOXIDE WHICH COMPIRSES CHARGING TO THE CARS OF A MUFFLED CONTINOUS TUNNEL KILN AT ITS INLET A MIXTURE OF SOLIDS CONTAINING CALCIUM SULPHATE, CARBONACEOUS MATERIAL AND SILICA, APPLYING HEAT EXTERNALLY TO THE MUFFLES OF THE KILN AND PROGRESSING THE CARS CONTINUOUSLY THROUGH THE KILN SO THAT THE MIXTURE CHARGED THEREON IS INDIRECTLY HEATED WITHIN THE KILN FROM THE TEMPERATURE AT WHICH IT IS CHARGED TO THE CARS TO A TEMPERATURE WITHIN THE RANGE OF 900* C. TO 1400* C., THE SAID INDIRECT HEATING TAKING PLACE IN THE ABSENCE OF ADDED OXYGEN FOR SUFFICIENT TIME TO INSURE SUBSTANTIAL REACTION OF THE COMPONENTS OF THE MIXTURE, CONTINUOUSLY WITHDRAWING CAR WITH REACTED SOLID RESIDUE AT THE OUTLET OF SAID TUNNEL KILN AND RECOVERING A GASEOUS MIXTURE RICH IN SULPHUR DIOXIDE FROM THE SPACE IN THE KILN ABOVE THE CARS.
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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) | 1957-08-30 | 1958-03-01 | 1958-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-30 | 1962-03-01 | 1962-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-30 | 1966-03-01 | 1966-08-31 | $7700.00 | Window Closed / Lapsed |