US2594371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential protective relaying system
Assignee: Individual
•
Filing: 1946-06-14
•
Granted: 1952-04-29
•
Expires: 1966-06-14
Abstract
No abstract record available.
Inventors
- 👤 Robert I Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:43
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/26; H02H3/28; H02H3/30; H02H3/302
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE19034E
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US1664225A
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US1873879A
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US1919231A
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US1930333A
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US2213294A
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US2217480A
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US2406615A
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US2406616A
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US2408868A
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US2406617A
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US2419904A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-29 | 1955-10-29 | 1956-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-29 | 1959-10-29 | 1960-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-29 | 1963-10-29 | 1964-04-29 | $7700.00 | Window Closed / Lapsed |