US2743087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Under-reaming tool
Assignee: LAYNE
•
Filing: 1952-10-13
•
Granted: 1956-04-24
•
Expires: 1972-10-13
Abstract
No abstract record available.
Inventors
- 👤 Leslie A Layne
- 👤 Louis C Mundt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:31
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/26; E21B10/32; E21B10/34; E21B10/345
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1571309A
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US1821473A
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US1834337A
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US1708932A
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US1857616A
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US1900226A
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US1981262A
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US1997436A
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US2203998A
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US2548931A
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US2644673A
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US2599060A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-24 | 1959-10-24 | 1960-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-24 | 1963-10-24 | 1964-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-24 | 1967-10-24 | 1968-04-24 | $7700.00 | Window Closed / Lapsed |