Patent US3259459A successfully refreshed from Google Patents.
US3259459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of sulfur trioxide
Assignee: Bayer AG
•
Filing: 1963-08-26
•
Granted: 1966-07-05
•
Expires: 1983-08-26
Abstract
No abstract record available.
Inventors
- 👤 Moller Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:25
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/69; C01B17/74; C01B17/76; C01B17/765; C01B17/7655
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
IN THE PROCESS FOR THE PRODUCTION OF SULFUR TRIOXIDE BY THE CATALYTIC OXIDATION OF SULFUR DIOXIDE-CONTAINING GASES THE IMPROVEMENT WHICH COMPRISES INTRODUCING THE SULFUR DIOXIDE-CONTAINING GASES INTO A FIRST CATALYST OXIDATION STAGE CONTAINING AN OXIDATION CATALYST AT THE INITATION TEMPERATURE FOR SAID CATALYST TO THEREBY PARTIALLY CATALYTICALLY CONVERT THE SULFUR DIOXIDE TO SULFUR TRIOXIDE, SEPARATING THE SULFUR TRIOXIDE FROM THE TAIL GAS FROM SAID FIRST CATALYST OXIDATION STAGE AND THEREAFTER PASSING THE TAIL GAS INTO AT LEAST ONE FURTHER CATALYST OXIDATION STAGE, CONTAINING AN OXIDATION CATALYST, AT A TEMPERATURE LOWER THAN THE INITIATION TEMPERATURE OF THE FIRST STAGE AND AT LEAST ABOUT 20*C. BELOW THE INITIATION TEMPERATURE WHICH WOULD BE REQUIRED BY SAID CATALYST IN SAID FURTHER CATALYTIC OXIDATION STAGE WITHOUT PRIOR SULFUR TRIOXIDE SEPRATION.
Claim 2
Dependent Claim
125 words
IN THE PROCESS FOR THE PRODUCTION OF SULFUR TRIOXIDE BY THE CATALYTIC OXIDATION OF SULFUR DIOXIDE-CONTAINING GASES THE IMPROVEMENT WHICH COMPRISES INTRODUCING THE SULFUR DIOXIDE-CONTAINING GASES INTO A FIRST CATALYST OXIDATION STAGE CONTAINING AN OXIDATION CATALYST AT THE INITATION TEMPERATURE FOR SAID CATALYST TO THEREBY PARTIALLY CATALYTICALLY CONVERT THE SULFUR DIOXIDE TO SULFUR TRIOXIDE, SEPARATING THE SULFUR TRIOXIDE FROM THE TAIL GAS FROM SAID FIRST CATALYST OXIDATION STAGE AND THEREAFTER PASSING THE TAIL GAS INTO AT LEAST ONE FURTHER CATALYST OXIDATION STAGE, CONTAINING AN OXIDATION CATALYST, AT A TEMPERATURE LOWER THAN THE INITIATION TEMPERATURE OF THE FIRST STAGE AND AT LEAST ABOUT 20*C. BELOW THE INITIATION TEMPERATURE WHICH WOULD BE REQUIRED BY SAID CATALYST IN SAID FURTHER CATALYTIC OXIDATION STAGE WITHOUT PRIOR SULFUR TRIOXIDE SEPRATION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-07-04 | 1970-01-03 | 1970-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-04 | 1974-01-03 | 1974-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-04 | 1978-01-03 | 1978-07-05 | $7700.00 | Window Closed / Lapsed |