Patent US2709490A successfully refreshed from Google Patents.
US2709490A
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US
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Tool for severing and milling away a section of casing in the bore of a well
Assignee: A 1 Bit & Tool Co Inc
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Filing: 1951-09-28
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Granted: 1955-05-31
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Expires: 1971-09-28
Abstract
No abstract record available.
Inventors
- 👤 Harry C Trimble
- 👤 Albert E Woelfel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:46
CPC Classifications
E; E21; E21B; E21B29/00; E21B29/06; E21B29/002; E21B29/005; Y; Y10; Y10T; Y10T409/00; Y10T409/30; Y10T409/304424; Y10T409/306216; Y10T409/306384
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1094169A
Cited
US2199020A
Cited
US2299528A
Cited
US2322694A
Cited
US2394236A
Cited
US2552543A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-30 | 1958-11-29 | 1959-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-30 | 1962-11-29 | 1963-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-30 | 1966-11-29 | 1967-05-31 | $7700.00 | Window Closed / Lapsed |