Patent US2350973A successfully refreshed from Google Patents.
US2350973A
Expired / Lapsed
US
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Pressure-actuated tubing anchor
Assignee: Shell Development Co
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Filing: 1943-10-30
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Granted: 1944-06-06
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Expires: 1963-10-30
Abstract
No abstract record available.
Inventors
- 👤 Edward C Brumleu
- 👤 Walton E Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:32
CPC Classifications
E; E21; E21B; E21B23/00; E21B23/04; E21B23/042; E21B23/0411
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1947-06-06 | 1947-12-06 | 1948-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-06-06 | 1951-12-06 | 1952-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-06-06 | 1955-12-06 | 1956-06-06 | $7700.00 | Window Closed / Lapsed |