US2986212A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for sealing water formations in a well
Assignee: Shell USA Inc
•
Filing: 1958-07-21
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Granted: 1961-05-30
•
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 13:12
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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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 |