Patent US3523580A successfully refreshed from Google Patents.
US3523580A
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Assignee: Schlumberger Technology Corp
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Filing: 1968-06-20
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Granted: 1970-08-11
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Expires: 1988-06-20
Abstract
No abstract record available.
Inventors
- 👤 Maurice P Lebourg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:59
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/26; G01M3/28; G01M3/2853; E; E21; E21B; E21B34/00; E21B34/06; E21B47/00; E21B47/10; E21B47/117
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2868297A
Cited
US3106932A
Cited
US3319717A
Cited
US3385370A
Cited
US3385372A
Cited
US3450206A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-10 | 1974-02-09 | 1974-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-10 | 1978-02-09 | 1978-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-10 | 1982-02-09 | 1982-08-11 | $7700.00 | Window Closed / Lapsed |