US2402573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency relay circuits
Assignee: Cutler Hammer Inc
•
Filing: 1944-02-23
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Granted: 1946-06-25
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Expires: 1964-02-23
Abstract
No abstract record available.
Inventors
- 👤 Pell Eric
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:06
CPC Classifications
H; H01; H01H; H01H47/00; H01H47/02; H01H47/20; H02; H02H; H02H3/00; H02H3/46
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) | 1949-06-24 | 1949-12-24 | 1950-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-06-24 | 1953-12-24 | 1954-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-06-24 | 1957-12-24 | 1958-06-25 | $7700.00 | Window Closed / Lapsed |