Patent US2925097A successfully refreshed from Google Patents.
US2925097A
Expired / Lapsed
US
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Covered tubular member for positioning in well flow pipe
Assignee: Individual
•
Filing: 1958-09-08
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Granted: 1960-02-16
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Expires: 1978-09-08
Abstract
No abstract record available.
Inventors
- 👤 Gerhard J Duesterberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:11
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1085; E21B43/00; E21B43/14; Y; Y10; Y10S; Y10S285/00; Y10S285/922
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-02-15 | 1963-08-17 | 1964-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-15 | 1967-08-17 | 1968-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-15 | 1971-08-17 | 1972-02-16 | $7700.00 | Window Closed / Lapsed |