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US2653305A
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Method of and apparatus for measuring the polarity of seismometers
Assignee: Phillips Petroleum Co
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Filing: 1949-06-10
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Granted: 1953-09-22
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Expires: 1969-06-10
Abstract
No abstract record available.
Inventors
- 👤 Jr Earl L De Shazo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:27
CPC Classifications
G; G01; G01V; G01V13/00; G01R; G01R19/00; G01R19/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US733627A
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US2307792A
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US2232476A
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US2338872A
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US2372056A
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US2423970A
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US2481282A
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US2591177A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-21 | 1957-03-23 | 1957-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-21 | 1961-03-23 | 1961-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-21 | 1965-03-23 | 1965-09-22 | $7700.00 | Window Closed / Lapsed |