Patent US2505541A successfully refreshed from Google Patents.
US2505541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Model airplane structure
Assignee: Individual
•
Filing: 1943-07-10
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Granted: 1950-04-25
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Expires: 1963-07-10
Abstract
No abstract record available.
Inventors
- 👤 Paul K Guillow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:46
CPC Classifications
A; A63; A63H; A63H27/00; A63H27/001
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1311351A
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US865419A
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US1342998A
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US1421621A
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US1408001A
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US1420805A
Cited
DE456499C
Cited
GB368911A
Cited
FR776303A
Cited
US2168653A
Cited
US2251090A
Cited
US2351504A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-24 | 1953-10-24 | 1954-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-24 | 1957-10-24 | 1958-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-24 | 1961-10-24 | 1962-04-25 | $7700.00 | Window Closed / Lapsed |