US3301339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bit with wear resistant material on blade
Assignee: ExxonMobil Upstream Research Co
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Filing: 1964-06-19
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Granted: 1967-01-31
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Expires: 1984-06-19
Abstract
No abstract record available.
Inventors
- 👤 Jr Eugene S Pennebaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:23
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/02; E21B10/04; E21B10/46; E21B10/48; E21B10/54; E21B10/56
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
118 words
A DRILL BIT ADAPTED TO BE ATTACHED TO A HOLLOW DRILL STRING WHICH COMPRISES A BODY MEMBER, A PLURALITY OF SPACED APART BLADES ATTACHED TO SAID BODY MEMBER, EACH OF SAID BLADES HAVING A LENGTH NO GREATER THAN THE DISTANCE FROM THE CENTER OF THE BODY MEMBER TO THE OUTER EDGE OF SAID BLADES, ABRASIVE MATERIAL OF PROGRESSIVELY INCREASING HARDNESS ON THE LEADING FACE OF EACH OF SAID BLADES, SAID ABRASIVE MATERIAL PROVIDING PROGRESSIVELY INCREASING WEAR RESISTANCE TO EACH OF SAID BLADES FROM THE INNER TO THE OUTER EDGE OF EACH OF SAID BLADES, AND FLUID PASSAGEWAYS DEFINED BY SAID BODY MEMBER TERMINATING IN NOZZLES ADAPTED TO DIRECT FLUID TO A POINT AHEAD OF EACH OF SAID BLADES.
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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) | 1970-01-30 | 1970-08-01 | 1971-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-30 | 1974-08-01 | 1975-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-30 | 1978-08-01 | 1979-01-31 | $7700.00 | Window Closed / Lapsed |