Patent US2931299A successfully refreshed from Google Patents.
US2931299A
Expired / Lapsed
US
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Impeller
Assignee: Individual
•
Filing: 1957-02-08
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Granted: 1960-04-05
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Expires: 1977-02-08
Abstract
No abstract record available.
Inventors
- 👤 Henry A Sokolowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:05
CPC Classifications
B; B64; B64D; B64D25/00; B64D25/08; B64D25/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR521654A
Cited
US1575071A
Cited
US1858969A
Cited
US1933694A
Cited
US2561670A
Cited
US2869825A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |