Patent US2742223A successfully refreshed from Google Patents.
US2742223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric propeller fans and the like
Assignee: Individual
•
Filing: 1953-01-02
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Granted: 1956-04-17
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Expires: 1973-01-02
Abstract
No abstract record available.
Inventors
- 👤 Font Eduardo Soler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:30
CPC Classifications
F; F04; F04D; F04D25/00; F04D25/02; F04D25/06; F04D25/0606; F04D25/0613; F04D25/064; F04D25/0646
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1632357A
Cited
US1921218A
Cited
US2225338A
Cited
US2171460A
Cited
US2482847A
Cited
US2634375A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-17 | 1959-10-17 | 1960-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-17 | 1963-10-17 | 1964-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-17 | 1967-10-17 | 1968-04-17 | $7700.00 | Window Closed / Lapsed |