US2917674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-speed current-comparison relay scheme
Assignee: Westinghouse Electric Corp
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Filing: 1954-10-22
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Granted: 1959-12-15
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Expires: 1974-10-22
Abstract
No abstract record available.
Inventors
- 👤 Shirley L Goldsborough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:24
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/26; H02H3/28; H02H3/30; H02H3/307
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2275941A
Cited
US2406616A
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US2408868A
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US2594371A
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US2539444A
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US2710368A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-14 | 1963-06-15 | 1963-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-14 | 1967-06-15 | 1967-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-14 | 1971-06-15 | 1971-12-15 | $7700.00 | Window Closed / Lapsed |