Patent US2050417A successfully refreshed from Google Patents.
US2554905A
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Seismic signal amplifier
Assignee: Seismograph Service Corp
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Filing: 1946-06-01
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Granted: 1951-05-29
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Expires: 1966-06-01
Abstract
No abstract record available.
Inventors
- 👤 James E Hawkins
- 👤 Jesse R Cornett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:18
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/24; G01V1/245
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2171671A
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US2250559A
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US2329558A
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US2295410A
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US2367049A
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US2298987A
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US2312642A
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US2401779A
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US2341336A
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US2383710A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-28 | 1954-11-27 | 1955-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-28 | 1958-11-27 | 1959-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-28 | 1962-11-27 | 1963-05-29 | $7700.00 | Window Closed / Lapsed |