Patent US2981464A successfully refreshed from Google Patents.
US2981464A
Expired / Lapsed
US
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Multiple propeller fan
Assignee: General Electric Co
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Filing: 1958-07-22
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Granted: 1961-04-25
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Expires: 1978-07-22
Abstract
No abstract record available.
Inventors
- 👤 William A Omohundro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:40
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/52; F04D29/522; F04D29/526; F04D25/00; F04D25/02; F04D25/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE388945C
Cited
US1021822A
Cited
GB191209582A
Cited
US1637398A
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US1717663A
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US2450745A
Cited
US2434678A
Cited
US2628020A
Cited
GB664011A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |