US2870908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrocyclones in closed-circuit grinding operations
Assignee: Dorr Oliver Inc
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Filing: 1954-12-17
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Granted: 1959-01-27
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Expires: 1974-12-17
Abstract
No abstract record available.
Inventors
- 👤 Elliot B Fitch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:37
CPC Classifications
B; B02; B02C; B02C17/00; B02C17/18; B02C21/00; B03; B03B; B03B9/00; B04; B04C; B04C9/00
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) | 1962-01-26 | 1962-07-28 | 1963-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-26 | 1966-07-28 | 1967-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-26 | 1970-07-28 | 1971-01-27 | $7700.00 | Window Closed / Lapsed |