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Patent US3474028A successfully refreshed from Google Patents.
US3474028A
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Process for the extraction of sulfur from a mineral oil-sulfur solution
Assignee: Wintershall AG
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Filing: 1967-07-10
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Granted: 1969-10-21
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Expires: 1987-07-10
Abstract
No abstract record available.
Inventors
- 👤 Walter Bulian
- 👤 Franz Feher
- 👤 Armin Dittmar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:20
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/22; C01B17/34; C09; C09K; C09K8/00; C09K8/52; C09K8/528; C09K8/532; C10; C10G; C10G29/00; C10G29/06; C10G29/10
Claims Analysis
Total Claims: 0
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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) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |