Patent US3409530A successfully refreshed from Google Patents.
US3409530A
Expired / Lapsed
US
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Helical electrode
Assignee: ConocoPhillips Co
•
Filing: 1965-10-20
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Granted: 1968-11-05
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Expires: 1985-10-20
Abstract
No abstract record available.
Inventors
- 👤 Carl E Locke
- 👤 Gerald D Harral
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:40
CPC Classifications
C; C23; C23F; C23F13/00; C23F13/005; C23F13/02; C23F13/06; C23F13/08; C23F13/10; F; F28; F28D; F28D7/00; F28D7/04; F28F; F28F19/00; F28F19/004; C23F2213/00; C23F2213/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US915846A
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US1506306A
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US2795541A
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US2765273A
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US2929769A
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US2908623A
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US3012958A
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US2941935A
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US3182007A
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US3022242A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-05 | 1972-05-06 | 1972-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-05 | 1976-05-06 | 1976-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-05 | 1980-05-06 | 1980-11-05 | $7700.00 | Window Closed / Lapsed |