Patent US4843639A successfully refreshed from Google Patents.
Patent US3363398A successfully refreshed from Google Patents.
US3363398A
Expired / Lapsed
US
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Sulphur trioxide
Assignee: Stanton and Staveley Ltd
•
Filing: 1965-03-23
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Granted: 1968-01-16
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Expires: 1985-03-23
Abstract
No abstract record available.
Inventors
- 👤 Wheatcroft John Brian
- 👤 Willacy Anthony Roy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:09
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/69; B; B01; B01D; B01D53/00; B01D53/34; F; F23; F23J; F23J11/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
A METHOD OF PRECIPITATING DUST PARTICLES IN WASTE GAS COMPRISING THE STEPS OF PASSING SAID GAS THROUGH A MECHANICAL SEPARATOR, INTRODUCING INTO SAID MECHANICALLY SEPARATED GAS A DISCRETE PORTION OF SOLID SULPHUR TRIOXIDE IN THE HIGHLY POLYMERIZED A FORM AND ENCASED IN A DISINTEGRATABLE CASING MATERIAL IMPERVIOUS TO SULPHUR TRIOXIDE AND ATMOSPHERIC MOISTURE WHILE MAINTAINING SAID GAS AT A TEMPERATURE ABOVE THE SUBLIMATION TEMPERATURE OF SULPHUR TRIOXIDE, WHEREBY SAID SULPHUR TRIOXIDE VAPORIZES, SAID CASING MATERIAL DISINTEGRATES, AND SAID SULPHUR TRIOXIDE IS RELEASED AND MIXES WITH SAID GAS, AND PASSING SAID SULPHUR TRIOXIDE CONTAINING WASTE GAS THROUGH AN ELECTROSTATIC PRECIPITATOR.
Claim 2
Independent Claim
99 words
A METHOD OF PRECIPITATING DUST PARTICLES IN WASTE GAS COMPRISING THE STEPS OF PASSING SAID GAS THROUGH A MECHANICAL SEPARATOR, INTRODUCING INTO SAID MECHANICALLY SEPARATED GAS A DISCRETE PORTION OF SOLID SULPHUR TRIOXIDE IN THE HIGHLY POLYMERIZED A FORM AND ENCASED IN A DISINTEGRATABLE CASING MATERIAL IMPERVIOUS TO SULPHUR TRIOXIDE AND ATMOSPHERIC MOISTURE WHILE MAINTAINING SAID GAS AT A TEMPERATURE ABOVE THE SUBLIMATION TEMPERATURE OF SULPHUR TRIOXIDE, WHEREBY SAID SULPHUR TRIOXIDE VAPORIZES, SAID CASING MATERIAL DISINTEGRATES, AND SAID SULPHUR TRIOXIDE IS RELEASED AND MIXES WITH SAID GAS, AND PASSING SAID SULPHUR TRIOXIDE CONTAINING WASTE GAS THROUGH AN ELECTROSTATIC PRECIPITATOR.
References Cited (Backward Citations)
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Cited
US1693251A
Cited
US1614737A
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US2036412A
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Cited
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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) | 1971-01-15 | 1971-07-17 | 1972-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-15 | 1975-07-17 | 1976-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-15 | 1979-07-17 | 1980-01-16 | $7700.00 | Window Closed / Lapsed |