US2639580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valveless pulse jet engine
Assignee: Individual
•
Filing: 1945-03-21
•
Granted: 1953-05-26
•
Expires: 1965-03-21
Abstract
No abstract record available.
Inventors
- 👤 James L Stuart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:02
CPC Classifications
F; F02; F02K; F02K7/00; F02K7/02; F02K7/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR412478A
Cited
AT63081B
Cited
US1329559A
Cited
US1369672A
Cited
FR530327A
Cited
GB293594A
Cited
US1852164A
Cited
GB439805A
Cited
US2195025A
Cited
US2325005A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-25 | 1956-11-24 | 1957-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-25 | 1960-11-24 | 1961-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-25 | 1964-11-24 | 1965-05-26 | $7700.00 | Window Closed / Lapsed |