US2470231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal-combustion operated free-piston machine
Assignee: Alan Muntz and Co Ltd
•
Filing: 1943-06-30
•
Granted: 1949-05-17
•
Expires: 1963-06-30
Abstract
No abstract record available.
Inventors
- 👤 Beale Evelyn Stewart Lansdowne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:38
CPC Classifications
F; F02; F02B; F02B71/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2086228A
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US2090709A
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US2115921A
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US2265285A
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US2108890A
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US2132083A
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US2168828A
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US2200892A
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US2241957A
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GB541779A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-16 | 1952-11-15 | 1953-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-16 | 1956-11-15 | 1957-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-16 | 1960-11-15 | 1961-05-17 | $7700.00 | Window Closed / Lapsed |