Patent US3574544A successfully refreshed from Google Patents.
US3574544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single-stage process for recovering sulfur values
Assignee: Boeing North American Inc
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Filing: 1968-11-26
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Granted: 1971-04-13
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Expires: 1988-11-26
Abstract
Abstract A METHOD FOR RECOVERING SULFUR VALUES FROM A MOLTEN SALT MIXTURE CONTAINING ALKALI METAL SULFATES OR SULFITES BY REACTING THE ALKALI METAL SULFATE- OR SULFITE-CONTAINING MOLTEN SOLUTION IN A SINGLE-STAGE TREATMENT WITH A GASEOUS MIXTURE CONTAINING HYDROGEN AND EITHER CARBON MONOXIDE OR CARBON DIOXIDE TO FORM HYDROGEN SULFIDE AND ALKALI METAL CARBONATES IN THE MOLTEN SALT.
Inventors
- 👤 Laszlo A Heredy
- 👤 Donald E Mckenzie
- 👤 Samuel J Yosim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:20
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/507
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) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |