Patent US2658622A successfully refreshed from Google Patents.
US2658622A
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US
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Fluid cleaning apparatus
Assignee: Thornhill Craver Co
•
Filing: 1949-12-03
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Granted: 1953-11-10
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Expires: 1969-12-03
Abstract
No abstract record available.
Inventors
- 👤 Homer E Thornhill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:40
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/23; B01D29/25; B01D29/62; B01D29/64; B01D29/6438; B01D29/6446; B01D29/6453
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US550583A
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US748821A
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US1464953A
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US1545896A
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US1628141A
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US1689277A
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US2193819A
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US2245575A
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US2547277A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-09 | 1957-05-11 | 1957-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-09 | 1961-05-11 | 1961-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-09 | 1965-05-11 | 1965-11-10 | $7700.00 | Window Closed / Lapsed |