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US3376403A
Expired / Lapsed
US
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Bottom-hole electric heater
Assignee: MINISTERUL PETROLULUI
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Filing: 1964-11-12
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Granted: 1968-04-02
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Expires: 1984-11-12
Abstract
No abstract record available.
Inventors
- 👤 Mircea Driga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:22
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/78
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1989582A
Cited
US2229680A
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US2302774A
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US2472445A
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US2635168A
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US2977454A
Cited
US3071675A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-02 | 1971-10-02 | 1972-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-02 | 1975-10-02 | 1976-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-02 | 1979-10-02 | 1980-04-02 | $7700.00 | Window Closed / Lapsed |