Patent US2921252A successfully refreshed from Google Patents.
US2921252A
Expired / Lapsed
US
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Electric generator
Assignee: Individual
•
Filing: 1957-05-28
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Granted: 1960-01-12
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Expires: 1977-05-28
Abstract
No abstract record available.
Inventors
- 👤 Edward L Schiavone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:18
CPC Classifications
H; H02; H02N; H02N2/00; H02N2/18; F; F23; F23Q; F23Q2/00; F23Q2/28; F23Q2/285; F23Q2/287; F23Q3/00; F23Q3/002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US405471A
Cited
US1900038A
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US2037165A
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US2311416A
Cited
US2659829A
Cited
US2676273A
Cited
US2691159A
Cited
US2856564A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |