US2894703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boundary layer control system
Assignee: Research Corp
•
Filing: 1954-05-27
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Granted: 1959-07-14
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Expires: 1974-05-27
Abstract
No abstract record available.
Inventors
- 👤 David C Hazen
- 👤 Friedrich O Ringleb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:06
CPC Classifications
B; B64; B64C; B64C23/00; B64C21/00; B64C21/02; B64C21/06; F; F15; F15C; F15C1/00; B64C2230/00; B64C2230/04; Y; Y02; Y02T; Y02T50/00; Y02T50/10; Y10; Y10T; Y10T137/00; Y10T137/206; Y10T137/2087
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) | 1962-07-13 | 1963-01-12 | 1963-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-13 | 1967-01-12 | 1967-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-13 | 1971-01-12 | 1971-07-14 | $7700.00 | Window Closed / Lapsed |