Patent US2946541A successfully refreshed from Google Patents.
US2946541A
Expired / Lapsed
US
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Airfoil fluid flow control system
Assignee: Individual
•
Filing: 1955-04-11
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Granted: 1960-07-26
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Expires: 1975-04-11
Abstract
No abstract record available.
Inventors
- 👤 John R Boyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:22
CPC Classifications
B; B64; B64C; B64C21/00; B64C21/10; B64C2230/00; B64C2230/12; F; F05; F05D; F05D2270/00; F05D2270/01; F05D2270/17; F05D2270/172; Y; Y02; Y02T; Y02T50/00; Y02T50/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-26 | 1964-01-25 | 1964-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-26 | 1968-01-25 | 1968-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-26 | 1972-01-25 | 1972-07-26 | $7700.00 | Window Closed / Lapsed |