Patent US3558272A successfully refreshed from Google Patents.
US3558272A
Expired / Lapsed
US
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Treatment of thiosulfate-containing solutions with hydrogen in the presence of a nickel sulfide catalyst
Assignee: Universal Oil Products Co
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Filing: 1968-08-15
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Granted: 1971-01-26
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Expires: 1988-08-15
Abstract
Abstract A WATER-SOLUBLE THIOSULFATE COMPOUND IS REDUCED TO ELEMENTAL SULFUR BY CONTACTING AN QUEOUS SOLUTION OF THE THIOSULFATE COMPOUND AND HYDROGEN WITH A SOLID CATALYST COMPRISING NICKEL SULFIDE AR REDUCTION CONDITIONS INCLUDING A TEMPERATURE OF ABOUT 100 TO ABOUT 300* C. AND A PRESSURE OF ABOUT 100 TO ABOUT 3000 P.S.I.G. TYPICALLY, THE ELEMENTAL SULFUR PRODUCED BY THE REDUCTION STEP IS RECOVERED IN THE FORM OF A POLYSULFIDE WHICH CAN, IF DESIRED, BE DECOMPOSED TO SEPARATE ELEMENTAL SULFUR.
Inventors
- 👤 Peter Urban
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:40
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/22; C01B17/34; C01B17/02; C01B17/06
Claims Analysis
Total Claims: 0
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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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |