US3149920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of sulfur
Assignee: Universal Oil Products Co
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Filing: 1961-07-21
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Granted: 1964-09-22
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Expires: 1981-07-21
Abstract
No abstract record available.
Inventors
- 👤 Urban Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:15
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/0404; C01B17/0426; C01B17/0439; C01B17/0434
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
90 words
A PROCESS FOR PRODUCING SULFUR WHICH COMPRISES REACTING HYDROGEN SULFIDE AND SULFUR DIOXIDE IN CONTACT WITH AN INITIALLY ANHYDROUS BED OF STRUCTURALLY STABLE CATALYST PREDOMINATING IN AN ACIDIC REFRACTORY OXIDE SELECTED FROM THE GROUP CONSISTING OF SILICA, ALUMINA AND A MIXTURE OF SILICA AND ALUMINA, THEREBY DEPOSITING SULFUR AND WATER IN THE CATALYST BED, PASSING AN ANHYDROUS ORGANIC SOLVENT THROUGH SAID BED TO DISSOLVE THE DEPOSITED SULFUR AND AZEOTROPE THE WATER, SEPARATELY REMOVING THE RESULTANT SOLUTION AND AZETROPE FROM THE CATALYST BED, AND THEREAFTER SEPARATING THE SULFUR FROM THE SOLVENT.
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) | 1967-09-22 | 1968-03-23 | 1968-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-22 | 1972-03-23 | 1972-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-22 | 1976-03-23 | 1976-09-22 | $7700.00 | Window Closed / Lapsed |