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US2415670A
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Aerodynamic brake
Assignee: Twin Disc Inc
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Filing: 1944-05-16
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Granted: 1947-02-11
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Expires: 1964-05-16
Abstract
No abstract record available.
Inventors
- 👤 James B Black
- 👤 Wilbur F Shurts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:49
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/008
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US56553A
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US289318A
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US1350018A
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US1483075A
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GB218859A
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US2014684A
Cited
US2130528A
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US2219215A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-02-10 | 1950-08-12 | 1951-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-02-10 | 1954-08-12 | 1955-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-02-10 | 1958-08-12 | 1959-02-11 | $7700.00 | Window Closed / Lapsed |