Patent US3452834A successfully refreshed from Google Patents.
US3378076A
Expired / Lapsed
US
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Erosion protection in wells
Assignee: Mobil Oil AS
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Filing: 1966-03-30
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Granted: 1968-04-16
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Expires: 1986-03-30
Abstract
No abstract record available.
Inventors
- 👤 Alvin V Metler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:46
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/14; E21B43/02; E21B43/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2119563A
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US2207334A
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US2303134A
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US2525897A
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US3013583A
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US3208533A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-16 | 1971-10-16 | 1972-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-16 | 1975-10-16 | 1976-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-16 | 1979-10-16 | 1980-04-16 | $7700.00 | Window Closed / Lapsed |