US2447629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for forming a section of casing below casing already in position in a well hole
Assignee: Richfield Oil Corp
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Filing: 1944-05-23
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Granted: 1948-08-24
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Expires: 1964-05-23
Abstract
No abstract record available.
Inventors
- 👤 Victor J Beissinger
- 👤 Glenn D Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:52
CPC Classifications
E; E21; E21B; E21B29/00; E21B29/10; E21B17/00; E21B43/00; E21B43/02; E21B43/10; E21B43/103
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) | 1951-08-24 | 1952-02-23 | 1952-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-24 | 1956-02-23 | 1956-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-24 | 1960-02-23 | 1960-08-24 | $7700.00 | Window Closed / Lapsed |