US2567490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tail-mounted jet propulsion unit for aircraft
Assignee: Individual
•
Filing: 1947-05-14
•
Granted: 1951-09-11
•
Expires: 1967-05-14
Abstract
No abstract record available.
Inventors
- 👤 Ljungstrom Birger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:16
CPC Classifications
F; F02; F02K; F02K1/00; F02K1/54; F02K1/56; F02K1/62; F02K1/06; F02K1/12; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/877; Y10T137/87708; Y10T137/87732
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1772196A
Cited
US1800794A
Cited
GB342260A
Cited
US1893995A
Cited
US1922167A
Cited
US2280835A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-10 | 1955-03-12 | 1955-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-10 | 1959-03-12 | 1959-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-10 | 1963-03-12 | 1963-09-11 | $7700.00 | Window Closed / Lapsed |