Patent US2239931A successfully refreshed from Google Patents.
Patent US1474960A successfully refreshed from Google Patents.
US1474960A
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US
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Electromagnetic brake
Assignee: Cutler Hammer Manufacturing Co
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Filing: 1921-07-02
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Granted: 1923-11-20
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Expires: 1941-07-02
Abstract
No abstract record available.
Inventors
- 👤 Jr Bernhard E Fernow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:06
CPC Classifications
F; F16; F16D; F16D49/00; F16D49/16; F16D59/00; F16D59/02; F16D2121/00; F16D2121/18; F16D2121/20; F16D2121/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1926-11-19 | 1927-05-21 | 1927-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1930-11-19 | 1931-05-21 | 1931-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1934-11-19 | 1935-05-21 | 1935-11-20 | $7700.00 | Window Closed / Lapsed |