Patent US2920306A successfully refreshed from Google Patents.
US2920306A
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Correlator for zero crossing pulses obtained from seismograms
Assignee: Jersey Production Research Co
•
Filing: 1954-04-12
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Granted: 1960-01-05
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Expires: 1974-04-12
Abstract
No abstract record available.
Inventors
- 👤 Frank J Feagin
- 👤 Carl R Wischmeyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:11
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/28; G01V1/36; G01V1/364; G01V1/366; G06; G06G; G06G7/00; G06G7/12; G06G7/19; G06G7/1914; G01V2210/00; G01V2210/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2161764A
Cited
US2276423A
Cited
US2427421A
Cited
US2539220A
Cited
US2578133A
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US2440971A
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US2588717A
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US2693908A
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US2620890A
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US2640275A
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US2779428A
Cited
US2791288A
Cited
US2688124A
Cited
US2767388A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-04 | 1963-07-06 | 1964-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-04 | 1967-07-06 | 1968-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-04 | 1971-07-06 | 1972-01-05 | $7700.00 | Window Closed / Lapsed |