Patent US5154854A successfully refreshed from Google Patents.
Patent US3717209A successfully refreshed from Google Patents.
US3717209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Replaceable wear-resistant element and method for replacing same
Assignee: Pacific Tooling and Engineering Co
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Filing: 1971-06-10
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Granted: 1973-02-20
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Expires: 1991-06-10
Abstract
Abstract AS A PREFERRED EMBODIMENT, A DRILL BIT IS DESCRIBED CONTAINING A PLURALITY OF WEAR-RESISTANT CUTTING ELEMENT ASSEMBLIES, EACH ASSEMBLY HAVING A REPLACEABLE WEAR-RESISTANT CUTTING ELEMENT SUPPORT IN A BIT RECESS WITH A SPLIT SLEEVE. THE RECESS HAS A SPACE BEHIND THE SLEEVE AND CUTTING ELEMENT WITH AN ANVIL MEMBER LOCATED THEREIN TO PREVENT FURTHER PENETRATION OF THE CUTTING ELEMENT, BUT WHICH ENABLES THE SLEEVE TO BE PUSHED FURTHER INTO THE RECESS TO RELEASE THE CUTTING ELEMENT WHEN A FORCE OF SUFFICIENT MAGNITUDE IS APPLIED THERETO. D R A W I N G
Inventors
- 👤 G Sheldon
- 👤 R Kimberling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:10
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/56
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |