Patent US2530651A successfully refreshed from Google Patents.
US2530651A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sand recovery apparatus
Assignee: Individual
•
Filing: 1946-05-02
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Granted: 1950-11-21
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Expires: 1966-05-02
Abstract
No abstract record available.
Inventors
- 👤 Alfred C Christensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:00
CPC Classifications
B; B22; B22C; B22C5/00; B22C5/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US797003A
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US1231790A
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US1272009A
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US1529808A
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US1529256A
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US1617955A
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US1867221A
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US1879680A
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US2302841A
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US2376177A
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US2412057A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-20 | 1954-05-22 | 1954-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-20 | 1958-05-22 | 1958-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-20 | 1962-05-22 | 1962-11-21 | $7700.00 | Window Closed / Lapsed |