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US2544021A
Expired / Lapsed
US
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Folding wing device
Assignee: Individual
•
Filing: 1948-05-03
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Granted: 1951-03-06
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Expires: 1968-05-03
Abstract
No abstract record available.
Inventors
- 👤 Holland James Wismer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:38
CPC Classifications
B; B64; B64C; B64C3/00; B64C3/38; B64C3/56
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB239971A
Cited
US1652618A
Cited
US1723962A
Cited
US1757109A
Cited
US1793056A
Cited
US1855012A
Cited
US2434068A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-05 | 1954-09-04 | 1955-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-05 | 1958-09-04 | 1959-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-05 | 1962-09-04 | 1963-03-06 | $7700.00 | Window Closed / Lapsed |