Patent US2690218A successfully refreshed from Google Patents.
US2690218A
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US
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Method of severing and milling a well casing
Assignee: Individual
•
Filing: 1952-10-06
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Granted: 1954-09-28
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Expires: 1972-10-06
Abstract
No abstract record available.
Inventors
- 👤 Earl J Robishaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:14
CPC Classifications
E; E21; E21B; E21B29/00; E21B29/002; E21B29/005; E21B43/00; E21B43/11; E21B43/112; Y; Y10; Y10T; Y10T409/00; Y10T409/30; Y10T409/303752; Y10T409/304088
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) | 1957-09-27 | 1958-03-29 | 1958-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-27 | 1962-03-29 | 1962-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-27 | 1966-03-29 | 1966-09-28 | $7700.00 | Window Closed / Lapsed |