Patent US3490286A successfully refreshed from Google Patents.
US3490286A
Expired / Lapsed
US
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Electrical apparatus for well tools
Assignee: Schlumberger Technology Corp
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Filing: 1967-08-03
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Granted: 1970-01-20
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Expires: 1987-08-03
Abstract
No abstract record available.
Inventors
- 👤 Robert J Schwartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:16
CPC Classifications
G; G01; G01V; G01V9/00; G01V9/005; E; E21; E21B; E21B47/00; E21B47/06; E21B47/07; G01K; G01K7/00; G01K7/32
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) | 1973-01-19 | 1973-07-21 | 1974-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-19 | 1977-07-21 | 1978-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-19 | 1981-07-21 | 1982-01-20 | $7700.00 | Window Closed / Lapsed |