US2780293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for sealing a borehole liner
Assignee: Individual
•
Filing: 1953-05-18
•
Granted: 1957-02-05
•
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
2026-11-06 19:47
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE23393E
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US1410827A
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US2196652A
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US2186349A
Cited
US2330144A
Cited
US2261292A
Cited
US2563284A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-05 | 1960-08-06 | 1961-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-05 | 1964-08-06 | 1965-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-05 | 1968-08-06 | 1969-02-05 | $7700.00 | Window Closed / Lapsed |