Patent US4852956A successfully refreshed from Google Patents.
Patent US2956167A successfully refreshed from Google Patents.
Patent US3913883A successfully refreshed from Google Patents.
Patent US3239275A successfully refreshed from Google Patents.
Patent DE448159C successfully refreshed from Google Patents.
Patent JPS5263518A successfully refreshed from Google Patents.
Patent US4194680A successfully refreshed from Google Patents.
Patent US1528544A successfully refreshed from Google Patents.
Patent US2567490A successfully refreshed from Google Patents.
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
2026-10-31 04:48
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
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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 |