Patent US2448855A successfully refreshed from Google Patents.
US2448855A
Expired / Lapsed
US
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Aerodynamic brake and hoist combination
Assignee: Twin Disc Inc
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Filing: 1944-05-16
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Granted: 1948-09-07
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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
2026-10-23 15:41
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/008; B; B66; B66D; B66D5/00; B66D5/02; B66D5/026
Claims Analysis
Total Claims: 0
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US2219215A
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US2253406A
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US2361007A
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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) | 1951-09-07 | 1952-03-08 | 1952-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-07 | 1956-03-08 | 1956-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-07 | 1960-03-08 | 1960-09-07 | $7700.00 | Window Closed / Lapsed |