Patent JPS5915641A successfully refreshed from Google Patents.
US3449657A
Expired / Lapsed
US
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Helical antenna for irradiating an earth formation penetrated by a borehole and method of using same
Assignee: Chevron USA Inc
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Filing: 1966-11-14
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Granted: 1969-06-10
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Expires: 1986-11-14
Abstract
No abstract record available.
Inventors
- 👤 Oke A Fredriksson
- 👤 F Nicholas Fossati
- 👤 F Alexander Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:18
CPC Classifications
H; H01; H01Q; H01Q11/00; H01Q11/02; H01Q11/08; G; G01; G01V; G01V3/00; G01V3/18; G01V3/30; H01Q1/00; H01Q1/36; H01Q1/362
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2616046A
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US2985878A
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FR1204354A
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US3066294A
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US2953786A
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US3083364A
Cited
US3111669A
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US3286163A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-09 | 1972-12-09 | 1973-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-09 | 1976-12-09 | 1977-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-09 | 1980-12-09 | 1981-06-10 | $7700.00 | Window Closed / Lapsed |