Patent US3024909A successfully refreshed from Google Patents.
US3024909A
Expired / Lapsed
US
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Vortical type grit separator
Assignee: PROCESS ENGINEERS Inc
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Filing: 1959-04-27
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Granted: 1962-03-13
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Expires: 1979-04-27
Abstract
No abstract record available.
Inventors
- 👤 Donald A Dahlstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:52
CPC Classifications
B; B04; B04C; B04C5/00; B04C5/08; B04C5/081
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1312098A
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US798473A
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US1301544A
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US1895504A
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US2098608A
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US2550340A
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GB669194A
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US2726763A
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US2726765A
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US2760635A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-03-12 | 1965-09-11 | 1966-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-03-12 | 1969-09-11 | 1970-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-03-12 | 1973-09-11 | 1974-03-13 | $7700.00 | Window Closed / Lapsed |