Patent US3406768A successfully refreshed from Google Patents.
US3406768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock drilling auger apparatus
Assignee: ALASKAUG Inc
•
Filing: 1966-09-09
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Granted: 1968-10-22
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Expires: 1986-09-09
Abstract
No abstract record available.
Inventors
- 👤 Robert W Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:34
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/02; E21B7/021
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2103137A
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US2259807A
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US2554005A
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US2731237A
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US2672322A
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US2797066A
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US2743083A
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US2856155A
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US2942849A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-22 | 1972-04-22 | 1972-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-22 | 1976-04-22 | 1976-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-22 | 1980-04-22 | 1980-10-22 | $7700.00 | Window Closed / Lapsed |