US3504757A
Expired / Lapsed
US
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Acoustic well-logging apparatus
Assignee: Schlumberger Technology Corp
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Filing: 1968-11-20
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Granted: 1970-04-07
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Expires: 1988-11-20
Abstract
No abstract record available.
Inventors
- 👤 Joseph E Chapman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:30
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/40; G01V1/52; Y; Y10; Y10S; Y10S181/00; Y10S181/40; Y10S181/402
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) | 1973-04-06 | 1973-10-06 | 1974-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-06 | 1977-10-06 | 1978-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-06 | 1981-10-06 | 1982-04-07 | $7700.00 | Window Closed / Lapsed |