Patent US3488559A successfully refreshed from Google Patents.
US3488559A
Expired / Lapsed
US
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Device for the detection of defects to the ground and the protection of line portions of a three-phase system having a ground neutral conductor
Assignee: Compteurs Schlumberger SA
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Filing: 1967-08-28
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Granted: 1970-01-06
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Expires: 1987-08-28
Abstract
No abstract record available.
Inventors
- 👤 Michel Henry Pierre Souillard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:42
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/38; H02H3/382
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-05 | 1973-07-07 | 1974-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-05 | 1977-07-07 | 1978-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-05 | 1981-07-07 | 1982-01-06 | $7700.00 | Window Closed / Lapsed |