US3755535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the removal of sulfur trioxide from industrial off gases
Assignee: Shell USA Inc
•
Filing: 1971-09-16
•
Granted: 1973-08-28
•
Expires: 1991-09-16
Abstract
Abstract A PROCESS FOR REMOVING SULFUR TRIOXIDE FROM INDUSTRIAL OFF-GASES CONTAINING SULFUR OXIDES BY CONTACTING THE GASES AT AN ELEVATED TEMPERATURE WITH A SOLID ACCEPTOR COMPRISING AN INORGANIC OXIDE WHICH IS SUBSTANTIALLY FREE OF DEPOSITED METALS OR METAL COMPOUNDS, AND REGENERATING THE LOADED ACCEPTOR WITH A HYDROGEN SULFIDE-CONTAINING GAS. OPTIONALLY, THE SULFUR COMPOUNDS IN THE OFF-GASES MAY FIRST BE OXIDIZED TO SULFUR TRIOXIDE PRIOR TO CONTACTING WITH THE SOLID ACCEPTOR.
Inventors
- 👤 J Naber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:00
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D53/04; B01D53/0407; B01D53/0423; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/508; B01D2251/00; B01D2251/60; B01D2251/602; B01D2253/00; B01D2253/10; B01D2253/104; B01D2253/106; B01D2253/25; B01D2255/00; B01D2255/20; B01D2255/202; B01D2255/2022; B01D2255/207; B01D2255/20723; B01D2255/90; B01D2255/92; B01D2255/9202; B01D2257/00; B01D2257/30; B01D2257/302; B01D2258/00; B01D2258/02; B01D2258/0283; B01D2259/00; B01D2259/40; B01D2259/40083; B01D2259/40086
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |