US3555503A
Expired / Lapsed
US
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Acceleration dependent phase control seismic exploration
Assignee: ELECTRONIC SYSTEMS Inc
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Filing: 1969-08-05
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Granted: 1971-01-12
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Expires: 1989-08-05
Abstract
Abstract SEISMIC WAVES ARE DETECTED AND RECORDED BY GENERATING ACCELERATION SIGNALS THROUGH PRESTRESSED PIEZOELECTRIC CRYSTALS OF WIDE BAND FREQUENCY CAPABILITY AND PASSING THE WIDE BAND SIGNAL TO A MULTI-STAGE AMPLIFIER HAVING WIDE BAND INPUT AND PROGRESSIVELY NARROWED FREQUENCY BAND THROUGH SUCCESSIVE STAGES OF THE AMPLIFIER WHILE RETAINING SIGNALS OF FREQUENCY IN THE RANGE OF ABOUT 100 CYCLES PER SECOND AND ABOVE.
Inventors
- 👤 Harold B Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:45
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/16; G01V1/18; G01V1/181; B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0607; G01V1/24; G01V1/245
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |