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US3512943A
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Sulfur extraction apparatus including residue treating flotation means
Assignee: Dubow Chemical Corp
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Filing: 1967-06-13
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Granted: 1970-05-19
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Expires: 1987-06-13
Abstract
No abstract record available.
Inventors
- 👤 Jerome Dubow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:12
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)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-18 | 1973-11-17 | 1974-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-18 | 1977-11-17 | 1978-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-18 | 1981-11-17 | 1982-05-19 | $7700.00 | Window Closed / Lapsed |