Patent US3429390A successfully refreshed from Google Patents.
US3429390A
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Earth-drilling bits
Assignee: Supercussion Drills Inc
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Filing: 1967-05-19
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Granted: 1969-02-25
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Expires: 1987-05-19
Abstract
No abstract record available.
Inventors
- 👤 Fred L Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 21:34
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1092; E21B10/00; E21B10/08; E21B10/083; E21B10/18; E21B10/22; E21B10/46; E21B10/56; E21B6/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1254267A
Cited
US1334632A
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US1784476A
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US1945240A
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US2013839A
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US2154032A
Cited
US2207188A
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US2598518A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-25 | 1972-08-26 | 1973-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-25 | 1976-08-26 | 1977-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-25 | 1980-08-26 | 1981-02-25 | $7700.00 | Window Closed / Lapsed |