US2770943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Turbines operated by free-piston gas generators
Assignee: Alan Muntz and Co Ltd
•
Filing: 1952-03-18
•
Granted: 1956-11-20
•
Expires: 1972-03-18
Abstract
No abstract record available.
Inventors
- 👤 Beale Evelyn Stewart Lansdowne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:31
CPC Classifications
F; F02; F02B; F02B71/00; F02B71/04; F02B71/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2421445A
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US2518660A
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GB591555A
Cited
FR952321A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-20 | 1960-05-21 | 1960-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-20 | 1964-05-21 | 1964-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-20 | 1968-05-21 | 1968-11-20 | $7700.00 | Window Closed / Lapsed |