Patent US1331412A successfully refreshed from Google Patents.
US1331412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal spar or girder for aircraft
Assignee: Individual
•
Filing: 1918-01-26
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Granted: 1920-02-17
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Expires: 1938-01-26
Abstract
No abstract record available.
Inventors
- 👤 Brown Edward Eugene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:47
CPC Classifications
B; B64; B64C; B64C1/00; B64C1/06; B64C1/065; B64C2001/0054; B64C2001/0081
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1923-02-16 | 1923-08-18 | 1924-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1927-02-16 | 1927-08-18 | 1928-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1931-02-16 | 1931-08-18 | 1932-02-17 | $7700.00 | Window Closed / Lapsed |