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US3520375A
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Method and apparatus for measuring mechanical characteristics of rocks while they are being drilled
Assignee: Societe Nationale des Petroles dAquitaine SA
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Filing: 1969-03-19
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Granted: 1970-07-14
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Expires: 1989-03-19
Abstract
No abstract record available.
Inventors
- 👤 Jean Raynal
- 👤 Serge Gstalder
- 👤 Claude Quichaud
- 👤 Michel Raynaud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:02
CPC Classifications
E; E21; E21B; E21B44/00; E21B49/00; E21B49/003
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) | 1973-07-13 | 1974-01-12 | 1974-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-13 | 1978-01-12 | 1978-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-13 | 1982-01-12 | 1982-07-14 | $7700.00 | Window Closed / Lapsed |