US3768581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frustro-conical drilling bit having radially tiered groups of teeth
Assignee: Total Compagnie Francaise des Petroles SA
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Filing: 1972-05-02
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Granted: 1973-10-30
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Expires: 1992-05-02
Abstract
Abstract A frustro-conical drilling bit having overlapping tiers of teeth arranged in radial groups. Each main group has an arched nose projection, alternate ones of which depend into a central cavity to define drilling mud channels. Intermediate teeth groups are positioned between the main groups and each is closer to the following main group in the direction of rotation.
Inventors
- 👤 C Rederon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:07
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/02; E21B10/04; E21B10/26; E21B10/60; E21B10/605
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
91 words
A drilling tool comprising a frustro-conical body bearing attack projections of metal teeth embedded with diamonds, each tooth having an outer peripheral surface with respect to the axis of the tool, front and rear radial surfaces and an upper surface intersecting the radial and peripheral surfaces, the teeth being disposed in concentric, tiered groups, orifices in the tool body for supplying drilling mud, the teeth being further arranged in radial rows, the peripheral surface of each tooth in the same radial row interrupting the upper surface of the lower adjacent tooth.
Claim 2
Dependent Claim
91 words
A drilling tool comprising a frustro-conical body bearing attack projections of metal teeth embedded with diamonds, each tooth having an outer peripheral surface with respect to the axis of the tool, front and rear radial surfaces and an upper surface intersecting the radial and peripheral surfaces, the teeth being disposed in concentric, tiered groups, orifices in the tool body for supplying drilling mud, the teeth being further arranged in radial rows, the peripheral surface of each tooth in the same radial row interrupting the upper surface of the lower adjacent tooth.
Claim 3
Dependent Claim
71 words
A drilling tool as claimed in claim 1, wherein the teeth of the radial rows are disposed in such a manner that the surface of the body of the tool between two consecutive projections forms a surface of tiers staggered both towards the base of the tool and towards its axis with respect to the tiers formed by the upper and peripheral surfaces of each tooth of the same radial row.
Claim 4
Dependent Claim
32 words
A drilling tool as claimed in claim 1 wherein the front radial surface of each tooth is inclined with respect to the tool axis at an angle of between 6* and 14*.
Claim 5
Dependent Claim
31 words
A drilling tool as claimed in claim 1, wherein the outer peripheral surface of each tooth is inclined with respect to the tool axis at an angle of 1* to 6*.
Claim 6
Dependent Claim
34 words
A drilling tool as claimed in claim 1, wherein the trailing edges of the upper surface of at least the three outermost teeth in the same radial row are substantially in the same plane.
Claim 7
Dependent Claim
25 words
A drilling tool as claimed in claim 1, wherein the upper surfaces of the teeth of the same concentric group are in the same plane.
Claim 8
Dependent Claim
25 words
A drilling tool as claimed in claim 1 wherein the peripheral surfaces of the teeth of the same concentric group define a generally conical surface.
Claim 9
Dependent Claim
30 words
A drilling tool as claimed in claim 1, wherein the front radial surface of each tooth in the same radial row intersects the upper surface of the lower adjacent tooth.
Claim 10
Dependent Claim
52 words
A drilling tool as claimed in claim 8, wherein the body also has a tiered configuration, and the front part of the upper surface of each tooth extends towards the axis of the tool as far as the peripheral surface of a body tier situated between two consecutive radial rows of teeth.
References Cited (Backward Citations)
US2607562A
Cited
US2894726A
Cited
US3127945A
Cited
US3135341A
Cited
US3181632A
Cited
US3696875A
Cited
US3599736A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |