Patent US3375897A successfully refreshed from Google Patents.
US3375897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waveform converter for acoustic well logging tools
Assignee: Dresser Industries Inc
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Filing: 1967-08-25
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Granted: 1968-04-02
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Expires: 1987-08-25
Abstract
No abstract record available.
Inventors
- 👤 Allen W Engle
- 👤 John L Casey
- 👤 Adrian P Brokaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:22
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/40; G01V1/44; G01V1/46
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) | 1971-04-02 | 1971-10-02 | 1972-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-02 | 1975-10-02 | 1976-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-02 | 1979-10-02 | 1980-04-02 | $7700.00 | Window Closed / Lapsed |