US3419092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well drilling method
Assignee: Walker Neer Manufacturing Co Inc
•
Filing: 1967-04-06
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Granted: 1968-12-31
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Expires: 1987-04-06
Abstract
No abstract record available.
Inventors
- 👤 Wayland D Elenburg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:17
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/12; E21B10/00; E21B10/02; E21B10/04; E21B21/00; E21B21/001; E21B21/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2093633A
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US2850264A
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US2984309A
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US3208539A
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US3095052A
Cited
US3292719A
Cited
US3338322A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-31 | 1972-07-01 | 1972-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-31 | 1976-07-01 | 1976-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-31 | 1980-07-01 | 1980-12-31 | $7700.00 | Window Closed / Lapsed |