US3054471A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic filters for attenuating vertically propagated interference in borehole seismology
Assignee: California Research LLC
•
Filing: 1960-01-15
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Granted: 1962-09-18
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Expires: 1980-01-15
Abstract
No abstract record available.
Inventors
- 👤 William C Knudsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:06
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/02; G10K11/04; G01; G01V; G01V1/00; G01V1/40; G01V1/52; G01V1/523
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1541275A
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US2916101A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-17 | 1966-03-19 | 1966-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-17 | 1970-03-19 | 1970-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-17 | 1974-03-19 | 1974-09-18 | $7700.00 | Window Closed / Lapsed |