US2773550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well casing protector method
Assignee: Oil Base Inc
•
Filing: 1953-02-09
•
Granted: 1956-12-11
•
Expires: 1973-02-09
Abstract
No abstract record available.
Inventors
- 👤 Doyne L Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:18
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/54; E; E21; E21B; E21B41/00; E21B41/02; Y; Y10; Y10S; Y10S166/00; Y10S166/902
Claims Analysis
Total Claims: 0
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US2352811A
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US2588280A
Cited
US2678697A
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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) | 1959-12-11 | 1960-06-11 | 1960-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-11 | 1964-06-11 | 1964-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-11 | 1968-06-11 | 1968-12-11 | $7700.00 | Window Closed / Lapsed |