Patent US2986212A successfully refreshed from Google Patents.
US2986212A
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Method and apparatus for sealing water formations in a well
Assignee: Shell USA Inc
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Filing: 1958-07-21
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Granted: 1961-05-30
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Expires: 1978-07-21
Abstract
No abstract record available.
Inventors
- 👤 Wilburn E Schultz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:41
CPC Classifications
E; E21; E21B; E21B27/00; E21B27/02; E21B33/00; E21B33/10; E21B33/13; E21B33/138
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2014563A
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US2064336A
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US2163449A
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US2236147A
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US2399125A
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US2357589A
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US2858892A
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US2715943A
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US2769498A
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US2856004A
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US2867278A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-29 | 1964-11-28 | 1965-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-29 | 1968-11-28 | 1969-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-29 | 1972-11-28 | 1973-05-30 | $7700.00 | Window Closed / Lapsed |