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Patent US2777112A successfully refreshed from Google Patents.
US2777112A
Expired / Lapsed
US
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Magnetometer survey apparatus
Assignee: United Geophysical Corp
•
Filing: 1953-11-12
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Granted: 1957-01-08
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Expires: 1973-11-12
Abstract
No abstract record available.
Inventors
- 👤 Frank B Coker
- 👤 Otto W Schoenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:40
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/02; G01R33/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US832171A
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US1383094A
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US2404806A
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US2502108A
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GB638147A
Cited
US2611802A
Cited
US2472944A
Cited
US2544548A
Cited
US2516172A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-08 | 1960-07-09 | 1961-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-08 | 1964-07-09 | 1965-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-08 | 1968-07-09 | 1969-01-08 | $7700.00 | Window Closed / Lapsed |