US3515943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical fault detector
Assignee: English Electric Co Ltd
•
Filing: 1967-09-29
•
Granted: 1970-06-02
•
Expires: 1987-09-29
Abstract
No abstract record available.
Inventors
- 👤 Albert R Van Cortla Warrington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:31
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/50; H02H1/00; H02H1/0007; H02H1/0015; H02H3/52
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3048744A
Cited
US2863100A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-01 | 1973-12-01 | 1974-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-01 | 1977-12-01 | 1978-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-01 | 1981-12-01 | 1982-06-02 | $7700.00 | Window Closed / Lapsed |