Patent US3447903A successfully refreshed from Google Patents.
US3447903A
Expired / Lapsed
US
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Sulphur production
Assignee: Freeport Minerals Co
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Filing: 1966-10-27
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Granted: 1969-06-03
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Expires: 1986-10-27
Abstract
No abstract record available.
Inventors
- 👤 Tadeusz K Wiewiorowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:59
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/0404; C01B17/0426; C01B17/0434; C01B17/05
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US927342A
Cited
US1083249A
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US2724641A
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US2994588A
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US3034865A
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US3278269A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |