Patent US2649935A successfully refreshed from Google Patents.
US2649935A
Expired / Lapsed
US
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Magnetic railway brake
Assignee: American Steel Foundries
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Filing: 1948-09-23
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Granted: 1953-08-25
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Expires: 1968-09-23
Abstract
No abstract record available.
Inventors
- 👤 Carl E Tack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:53
CPC Classifications
F; F16; F16D; F16D57/00; F16D57/002; B; B60; B60T; B60T13/00; B60T13/74
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2052200A
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US2052846A
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US2438482A
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US2382552A
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US2575360A
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US2525571A
Cited
US2519449A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-24 | 1957-02-23 | 1957-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-24 | 1961-02-23 | 1961-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-24 | 1965-02-23 | 1965-08-25 | $7700.00 | Window Closed / Lapsed |