Patent US3434552A successfully refreshed from Google Patents.
US3434552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-centering cutter bit for drills
Assignee: Hughes Tool Co
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Filing: 1967-03-08
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Granted: 1969-03-25
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Expires: 1987-03-08
Abstract
No abstract record available.
Inventors
- 👤 Arnold B Bower Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:55
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/58
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1899458A
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US2030576A
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US2022194A
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US2166478A
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GB634743A
Cited
US2575239A
Cited
US2842342A
Cited
US3032129A
Cited
US3089552A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-24 | 1972-09-23 | 1973-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-24 | 1976-09-23 | 1977-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-24 | 1980-09-23 | 1981-03-25 | $7700.00 | Window Closed / Lapsed |