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US2731332A
Expired / Lapsed
US
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Process for extraction of sulfur from sulfur ores
Assignee: Individual
•
Filing: 1955-01-06
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Granted: 1956-01-17
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Expires: 1975-01-06
Abstract
No abstract record available.
Inventors
- 👤 Ackert George Ford
- 👤 Russell A Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:40
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/02; C01B17/027; C01B17/033
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1374422A
Cited
US1328210A
Cited
US1970147A
Cited
US2044214A
Cited
US2211026A
Cited
US2253566A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-16 | 1959-07-18 | 1960-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-16 | 1963-07-18 | 1964-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-16 | 1967-07-18 | 1968-01-17 | $7700.00 | Window Closed / Lapsed |