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US3398356A
Expired / Lapsed
US
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Method utilizing a pair of subsurface antennas for determining the physical properties effecting radio energy propagation through earth
Assignee: Westinghouse Electric Corp
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Filing: 1964-02-10
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Granted: 1968-08-20
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Expires: 1984-02-10
Abstract
No abstract record available.
Inventors
- 👤 William L Still
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:59
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3123767A
Cited
US3125717A
Cited
US2139460A
Cited
US2268106A
Cited
US2992325A
Cited
US3087111A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-20 | 1972-02-19 | 1972-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-20 | 1976-02-19 | 1976-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-20 | 1980-02-19 | 1980-08-20 | $7700.00 | Window Closed / Lapsed |