US2421870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air brake for aircraft
Assignee: Individual
•
Filing: 1939-01-23
•
Granted: 1947-06-10
•
Expires: 1959-01-23
Abstract
No abstract record available.
Inventors
- 👤 Dornier Claude
- 👤 Wahner Hubert
- 👤 Bottling Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:50
CPC Classifications
B; B64; B64D; B64D27/00; B64D27/02; B64D27/023
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR374737A
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US1019647A
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US1125365A
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US1274986A
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US1297604A
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US1351905A
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US1433395A
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FR593572A
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US1780410A
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US1772388A
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US1834149A
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US1858112A
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US1972967A
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US2095020A
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FR815858A
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FR829680A
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US2101443A
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US2139163A
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US2254591A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-09 | 1950-12-09 | 1951-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-09 | 1954-12-09 | 1955-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-09 | 1958-12-09 | 1959-06-10 | $7700.00 | Window Closed / Lapsed |