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Patent US2689783A successfully refreshed from Google Patents.
US2689783A
Expired / Lapsed
US
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Continuous process for purifying raw sulfur
Assignee: Montedison SpA
•
Filing: 1951-02-08
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Granted: 1954-09-21
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Expires: 1971-02-08
Abstract
No abstract record available.
Inventors
- 👤 Marullo Gerlando
- 👤 Maragliano Domenico
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:04
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/02; C01B17/0232
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1031160A
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GB314697A
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GB350574A
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US1967874A
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GB385352A
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DE637528C
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US2353959A
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US2424336A
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US2433552A
Cited
US2554109A
Cited
US2626889A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-20 | 1958-03-22 | 1958-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-20 | 1962-03-22 | 1962-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-20 | 1966-03-22 | 1966-09-21 | $7700.00 | Window Closed / Lapsed |