Patent US2968740A successfully refreshed from Google Patents.
US2968740A
Expired / Lapsed
US
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Magnetic brakes
Assignee: British Thomson Houston Co Ltd
•
Filing: 1958-07-21
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Granted: 1961-01-17
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Expires: 1978-07-21
Abstract
No abstract record available.
Inventors
- 👤 Coe Reginald Thornton
- 👤 Griffiths Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:49
CPC Classifications
H; H02; H02K; H02K49/00; H02K49/02; H02K49/04; H02K49/046
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2487551A
Cited
FR1094894A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-17 | 1964-07-18 | 1965-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-17 | 1968-07-18 | 1969-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-17 | 1972-07-18 | 1973-01-17 | $7700.00 | Window Closed / Lapsed |