Patent US2449223A successfully refreshed from Google Patents.
US2449223A
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US
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Braking device for electric motors
Assignee: Whitnash PLC
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Filing: 1945-11-27
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Granted: 1948-09-14
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Expires: 1965-11-27
Abstract
No abstract record available.
Inventors
- 👤 Hayman Bernard Max
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:10
CPC Classifications
H; H02; H02P; H02P3/00; H02P3/06; H02P3/08; H02P3/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-09-14 | 1952-03-15 | 1952-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-14 | 1956-03-15 | 1956-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-14 | 1960-03-15 | 1960-09-14 | $7700.00 | Window Closed / Lapsed |