US2725513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective systems for direct current motors
Assignee: Cutler Hammer Inc
•
Filing: 1953-03-06
•
Granted: 1955-11-29
•
Expires: 1973-03-06
Abstract
No abstract record available.
Inventors
- 👤 Robert N Eck
- 👤 Fred S Horner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:54
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/08; H02H7/0811
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1551400A
Cited
US1787278A
Cited
US1861149A
Cited
US1886773A
Cited
US2057909A
Cited
US2149485A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-11-28 | 1959-05-30 | 1959-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-28 | 1963-05-30 | 1963-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-28 | 1967-05-30 | 1967-11-29 | $7700.00 | Window Closed / Lapsed |