US3548302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for detecting faults in the insulation covering of insulated electric conductors including means for causing a fluctuating current to flow through a bare portion of the insulation
Assignee: Balfour Beatty PLC
•
Filing: 1968-07-09
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Granted: 1970-12-15
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Expires: 1988-07-09
Abstract
No abstract record available.
Inventors
- 👤 Alan Arnold
- 👤 John Baird Childs
- 👤 Kenneth William Ffitch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:40
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/12; G01R31/1227; G01R31/1263; G01R31/1272; G01R31/50; G01R31/58; G01R31/59
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2731202A
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US2701336A
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US2894204A
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US3082871A
Cited
US3281675A
Cited
US3323701A
Cited
US3389789A
Cited
US3364421A
Cited
US3411078A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-14 | 1974-06-15 | 1974-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-14 | 1978-06-15 | 1978-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-14 | 1982-06-15 | 1982-12-15 | $7700.00 | Window Closed / Lapsed |