Patent US2990904A successfully refreshed from Google Patents.
US2990904A
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Method and apparatus for continuous geophysical exploration
Assignee: Seismograph Service Corp
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Filing: 1956-06-18
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Granted: 1961-07-04
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Expires: 1976-06-18
Abstract
No abstract record available.
Inventors
- 👤 James E Hawkins
- 👤 Arrow Broken
- 👤 Stanley W Wilcox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:56
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/02; G01V1/00; G01V1/16; G01V1/20; Y; Y10; Y10S; Y10S181/00; Y10S181/40; Y10S181/401
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2377903A
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US2192404A
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US2253975A
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US2378440A
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US2412363A
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US2769966A
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US2531088A
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US2738488A
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US2780301A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |