US2696264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible well liner
Assignee: Individual
•
Filing: 1951-10-15
•
Granted: 1954-12-07
•
Expires: 1971-10-15
Abstract
No abstract record available.
Inventors
- 👤 Andrew J Colmerauer
- 👤 Leo T Langer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:11
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/02; E21B43/08; E21B43/086; E21B43/10; E21B43/103
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US171389A
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US1424109A
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US2084185A
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US2061317A
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US2226804A
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US2238533A
Cited
US2296161A
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US2381096A
Cited
US2397070A
Cited
US2526105A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-06 | 1958-06-07 | 1958-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-06 | 1962-06-07 | 1962-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-06 | 1966-06-07 | 1966-12-07 | $7700.00 | Window Closed / Lapsed |