Patent US2964730A successfully refreshed from Google Patents.
US2964730A
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US
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Electro-acoustic transducer having coaxially spaced cylindrical coils
Assignee: Schlumberger Well Surveying Corp
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Filing: 1955-02-25
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Granted: 1960-12-13
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Expires: 1975-02-25
Abstract
No abstract record available.
Inventors
- 👤 Blanchard Andre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:08
CPC Classifications
G; G10; G10K; G10K9/00; G10K9/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2712124A
Cited
US1451880A
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US2160007A
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US2355680A
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US2429104A
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US2398587A
Cited
US2648837A
Cited
US2749532A
Cited
US2776416A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-13 | 1964-06-13 | 1964-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-13 | 1968-06-13 | 1968-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-13 | 1972-06-13 | 1972-12-13 | $7700.00 | Window Closed / Lapsed |