US2775304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for providing ducts between borehole wall and casing
Assignee: Individual
•
Filing: 1953-05-18
•
Granted: 1956-12-25
•
Expires: 1973-05-18
Abstract
No abstract record available.
Inventors
- 👤 Zandmer Solis Myron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:35
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/11
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) | 1959-12-25 | 1960-06-25 | 1960-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-25 | 1964-06-25 | 1964-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-25 | 1968-06-25 | 1968-12-25 | $7700.00 | Window Closed / Lapsed |