Patent US2660310A successfully refreshed from Google Patents.
US2660310A
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Sediment removal apparatus
Assignee: HANNAH JANE HAPMAN
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Filing: 1950-11-15
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Granted: 1953-11-24
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Expires: 1970-11-15
Abstract
No abstract record available.
Inventors
- 👤 Henry W Hapman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:53
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/16; B01D21/00; B01D21/02; B01D21/04; B01D21/18
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) | 1956-11-23 | 1957-05-25 | 1957-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-23 | 1961-05-25 | 1961-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-23 | 1965-05-25 | 1965-11-24 | $7700.00 | Window Closed / Lapsed |