Patent US2429477A successfully refreshed from Google Patents.
US2429477A
Expired / Lapsed
US
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Recovery of sulphur from sulphur ores
Assignee: Individual
•
Filing: 1941-03-11
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Granted: 1947-10-21
•
Expires: 1961-03-11
Abstract
No abstract record available.
Inventors
- 👤 Arthur B Menefee
- 👤 Herbert H Greger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:40
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/02; C01B17/027
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US204206A
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US298734A
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US1457793A
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US793808A
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US955012A
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US1656505A
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US1889429A
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US1697402A
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US1990602A
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US1884634A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-20 | 1951-04-21 | 1951-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-20 | 1955-04-21 | 1955-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-20 | 1959-04-21 | 1959-10-21 | $7700.00 | Window Closed / Lapsed |