US5460233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diamond cutting structure for drilling hard subterranean formations
Assignee: Baker Hughes Holdings LLC
•
Filing: 1993-03-30
•
Granted: 1995-10-24
•
Expires: 2013-03-30
Abstract
Abstract A rotary drag bit for drilling hard rock formations with substantially planar PDC cutting elements having diamond tables backed by substrates which flare or taper laterally outwardly and rearwardly of the cutting edge of the diamond table. A cutting structure defining a "lipped" cutting edge is also disclosed.
Inventors
- 👤 Nigel C. Meany
- 👤 Craig H. Cooley
- 👤 Gordon A. Tibbitts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:17
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/56; E21B10/567; E21B10/5673; E21B10/573; Y; Y10; Y10T; Y10T407/00; Y10T407/26
Claims Analysis
Total Claims: 44
Claim 1
Independent Claim
103 words
A cutting element for a rotary drag bit used in drilling subterranean formations comprising: a substantially planar table of superhard material, said superhard table having a flat cutting surface on one side thereof and a cutting edge bordering said cutting surface along at least a portion of the periphery thereof; and a substrate behind, secured to and supporting said superhard table at a side thereof opposite said cutting surface, said substrate being of no greater lateral extent than said superhard table proximate said cutting edge and increasing in lateral extent beyond said cutting edge as said substrate extends rearwardly from said superhard table.
Claim 2
Dependent Claim
103 words
A cutting element for a rotary drag bit used in drilling subterranean formations comprising: a substantially planar table of superhard material, said superhard table having a flat cutting surface on one side thereof and a cutting edge bordering said cutting surface along at least a portion of the periphery thereof; and a substrate behind, secured to and supporting said superhard table at a side thereof opposite said cutting surface, said substrate being of no greater lateral extent than said superhard table proximate said cutting edge and increasing in lateral extent beyond said cutting edge as said substrate extends rearwardly from said superhard table.
Claim 3
Dependent Claim
19 words
The cutting element of claim 1, wherein said superhard table is substantially circular, and said substrate is substantially frustoconical.
Claim 4
Dependent Claim
33 words
The cutting element of claim 1, wherein said superhard table is substantially semicircular, said cutting edge is comprised of an arcuate segment of the boundary of said semi-circle, and said substrate is half-frustoconical.
Claim 5
Dependent Claim
27 words
The cutting element of claim 1, wherein said substrate flares or tapers laterally outwardly and rearwardly from said superhard table cutting edge in a substantially continuous manner.
Claim 6
Dependent Claim
33 words
The cutting element of claim 1, wherein at least a portion of said substrate behind said cutting edge is of slightly smaller lateral extent than said superhard table, so to define a lip.
Claim 7
Dependent Claim
13 words
The cutting element of claim 1, wherein said superhard table comprises a PDC.
Claim 8
Dependent Claim
12 words
The cutting element of claim 1, wherein said cutting edge is chamfered.
Claim 9
Dependent Claim
12 words
The cutting element of claim 1, wherein said cutting edge is rounded.
Claim 10
Dependent Claim
14 words
The cutting element of claim 1, wherein said superhard table is of nonuniform thickness.
Claim 11
Dependent Claim
20 words
The cutting element of claim 1, further comprising a carrier element to which the rear of said substrate is secured.
Claim 12
Dependent Claim
13 words
The cutting element of claim 10, wherein said carrier element comprises a cylinder.
Claim 13
Dependent Claim
13 words
The cutting element of claim 10, wherein said carrier element comprises a stud.
Claim 14
Dependent Claim
114 words
A fixed-cutter rotary drag bit for drilling subterranean formations, comprising: a shank; a bit crown secured to said shank and having a face opposite thereto; and at least one superhard cutting element secured to said crown face; said at least one superhard cutting element comprising a substantially planar table of superhard material having a flat cutting surface and a cutting edge along at least a portion of the periphery of said cutting surface, and a supporting substrate to the rear of said superhard table, the outer lateral dimension of said substrate being no greater than that of said superhard table proximate said cutting edge and extending laterally outwardly and rearwardly behind said cutting edge.
Claim 15
Dependent Claim
114 words
A fixed-cutter rotary drag bit for drilling subterranean formations, comprising: a shank; a bit crown secured to said shank and having a face opposite thereto; and at least one superhard cutting element secured to said crown face; said at least one superhard cutting element comprising a substantially planar table of superhard material having a flat cutting surface and a cutting edge along at least a portion of the periphery of said cutting surface, and a supporting substrate to the rear of said superhard table, the outer lateral dimension of said substrate being no greater than that of said superhard table proximate said cutting edge and extending laterally outwardly and rearwardly behind said cutting edge.
Claim 16
Dependent Claim
20 words
The rotary drag bit of claim 13, wherein said superhard table is substantially circular, and said substrate is substantially frustoconical.
Claim 17
Dependent Claim
34 words
The rotary drag bit of claim 13, wherein said superhard table is substantially semicircular, said cutting edge is comprised of an arcuate segment of the boundary of said semi-circle, and said substrate is half-frustoconical.
Claim 18
Dependent Claim
28 words
The rotary drag bit of claim 13, wherein said substrate flares or tapers laterally outwardly and rearwardly from said diamond table cutting edge in a substantially continuous manner.
Claim 19
Dependent Claim
34 words
The rotary drag bit of claim 13, wherein at least a portion of said substrate behind said cutting edge is of slightly smaller lateral extent than said superhard table, so to define a lip.
Claim 20
Dependent Claim
25 words
The rotary drag bit of claim 13, further including a carrier element secured to said bit crown face and to which said substrate is secured.
Claim 21
Dependent Claim
28 words
The rotary drag bit of claim 18, wherein said carrier element comprises a cylinder, and the rear of said substrate is secured to one end of said cylinder.
Claim 22
Dependent Claim
33 words
The rotary drag bit of claim 18, wherein said carrier element comprises a stud inserted in an aperture in said bit face, and the rear of said substrate is secured to said stud.
Claim 23
Dependent Claim
13 words
The cutting element of claim 13, wherein said superhard table comprises a PDC.
Claim 24
Dependent Claim
26 words
The rotary drag bit of claim 13, wherein said substrate extends laterally outwardly and rearwardly behind said superhard table cutting edge in a substantially continuous manner.
Claim 25
Dependent Claim
15 words
The rotary drag bit of claim 13, wherein said superhard table is of nonuniform thickness.
Claim 26
Dependent Claim
72 words
A cutting element for a rotary drag bit used in drilling subterranean formations, comprising: a substantially planar table of superhard material having a cutting edge; and a substrate behind and supporting said superhard table and including at least a portion having a smaller lateral extent than said superhard table so as to define a lip associated with said cutting edge, said substrate flaring or tapering outwardly and rearwardly from said cutting edge.
Claim 27
Dependent Claim
72 words
A cutting element for a rotary drag bit used in drilling subterranean formations, comprising: a substantially planar table of superhard material having a cutting edge; and a substrate behind and supporting said superhard table and including at least a portion having a smaller lateral extent than said superhard table so as to define a lip associated with said cutting edge, said substrate flaring or tapering outwardly and rearwardly from said cutting edge.
Claim 28
Dependent Claim
13 words
The cutting element of claim 24, wherein said superhard table comprises a PDC.
Claim 29
Dependent Claim
103 words
A cutting element for a rotary drag bit used in drilling subterranean formations comprising: a substantially planar table of superhard material, said superhard table having a cutting surface on one side thereof and a rounded cutting edge bordering said cutting surface along at least a portion of the periphery thereof; and a substrate behind, secured to and supporting said superhard table at a side thereof opposite said cutting surface, said substrate being of no greater lateral extent than said superhard table proximate said cutting edge and increasing in lateral extent beyond said cutting edge as said substrate extends rearwardly from said superhard table.
Claim 30
Dependent Claim
103 words
A cutting element for a rotary drag bit used in drilling subterranean formations comprising: a substantially planar table of superhard material, said superhard table having a cutting surface on one side thereof and a rounded cutting edge bordering said cutting surface along at least a portion of the periphery thereof; and a substrate behind, secured to and supporting said superhard table at a side thereof opposite said cutting surface, said substrate being of no greater lateral extent than said superhard table proximate said cutting edge and increasing in lateral extent beyond said cutting edge as said substrate extends rearwardly from said superhard table.
Claim 31
Dependent Claim
107 words
A cutting element for a rotary drag bit used in drilling subterranean formations comprising: a substantially planar table of superhard material, said superhard table being of nonuniform thickness and having a cutting surface on one side thereof and a cutting edge bordering said cutting surface along at least a portion of the periphery thereof; and a substrate behind, secured to and supporting said superhard table at a side thereof opposite said cutting surface, said substrate being of no greater lateral extent than said superhard table proximate said cutting edge and increasing in lateral extent beyond said cutting edge as said substrate extends rearwardly from said superhard table.
Claim 32
Dependent Claim
107 words
A cutting element for a rotary drag bit used in drilling subterranean formations comprising: a substantially planar table of superhard material, said superhard table being of nonuniform thickness and having a cutting surface on one side thereof and a cutting edge bordering said cutting surface along at least a portion of the periphery thereof; and a substrate behind, secured to and supporting said superhard table at a side thereof opposite said cutting surface, said substrate being of no greater lateral extent than said superhard table proximate said cutting edge and increasing in lateral extent beyond said cutting edge as said substrate extends rearwardly from said superhard table.
Claim 33
Dependent Claim
103 words
A cutting element for a rotary drag bit used in drilling subterranean formations comprising: a substantially planar table of superhard material, said superhard table having a convex cutting surface on one side thereof and a cutting edge bordering said cutting surface along at least a portion of the periphery thereof; and a substrate behind, secured to and supporting said superhard table at a side thereof opposite said cutting surface, said substrate being of no greater lateral extent than said superhard table proximate said cutting edge and increasing in lateral extent beyond said cutting edge as said substrate extends rearwardly from said superhard table.
Claim 34
Dependent Claim
103 words
A cutting element for a rotary drag bit used in drilling subterranean formations comprising: a substantially planar table of superhard material, said superhard table having a convex cutting surface on one side thereof and a cutting edge bordering said cutting surface along at least a portion of the periphery thereof; and a substrate behind, secured to and supporting said superhard table at a side thereof opposite said cutting surface, said substrate being of no greater lateral extent than said superhard table proximate said cutting edge and increasing in lateral extent beyond said cutting edge as said substrate extends rearwardly from said superhard table.
Claim 35
Dependent Claim
103 words
A cutting element for a rotary drag bit used in drilling subterranean formations comprising: a substantially planar table of superhard material, said superhard table having a ridged cutting surface on one side thereof and a cutting edge bordering said cutting surface along at least a portion of the periphery thereof; and a substrate behind, secured to and supporting said superhard table at a side thereof opposite said cutting surface, said substrate being of no greater lateral extent than said superhard table proximate said cutting edge and increasing in lateral extent beyond said cutting edge as said substrate extends rearwardly from said superhard table.
Claim 36
Dependent Claim
103 words
A cutting element for a rotary drag bit used in drilling subterranean formations comprising: a substantially planar table of superhard material, said superhard table having a ridged cutting surface on one side thereof and a cutting edge bordering said cutting surface along at least a portion of the periphery thereof; and a substrate behind, secured to and supporting said superhard table at a side thereof opposite said cutting surface, said substrate being of no greater lateral extent than said superhard table proximate said cutting edge and increasing in lateral extent beyond said cutting edge as said substrate extends rearwardly from said superhard table.
Claim 37
Dependent Claim
98 words
A fixed-cutter rotary drag bit for drilling subterranean formations, comprising: a shank; a bit crown secured to said shank and having a face opposite thereto; and at least one superhard cutting element secured to said crown face; said at least one superhard cutting element comprising a substantially planar table of superhard material having a flat cutting surface and a cutting edge along at least a portion of the periphery of said cutting surface, and a supporting substrate to the rear of said superhard table, the outer lateral dimension of said substrate extending laterally outwardly beyond said cutting edge.
Claim 38
Dependent Claim
98 words
A fixed-cutter rotary drag bit for drilling subterranean formations, comprising: a shank; a bit crown secured to said shank and having a face opposite thereto; and at least one superhard cutting element secured to said crown face; said at least one superhard cutting element comprising a substantially planar table of superhard material having a flat cutting surface and a cutting edge along at least a portion of the periphery of said cutting surface, and a supporting substrate to the rear of said superhard table, the outer lateral dimension of said substrate extending laterally outwardly beyond said cutting edge.
Claim 39
Dependent Claim
78 words
A cutting element for a rotary drag bit used in drilling subterranean formations comprising: a substantially planar table of superhard material, said superhard table having a flat cutting surface on one side thereof and a cutting edge bordering said cutting surface along at least a portion of the periphery thereof; and a substrate behind, secured to and supporting said superhard table at a side thereof opposite said cutting surface, said substrate extending laterally outwardly beyond said cutting edge.
Claim 40
Dependent Claim
78 words
A cutting element for a rotary drag bit used in drilling subterranean formations comprising: a substantially planar table of superhard material, said superhard table having a flat cutting surface on one side thereof and a cutting edge bordering said cutting surface along at least a portion of the periphery thereof; and a substrate behind, secured to and supporting said superhard table at a side thereof opposite said cutting surface, said substrate extending laterally outwardly beyond said cutting edge.
Claim 41
Dependent Claim
115 words
A fixed-cutter rotary drag bit for drilling subterranean formations, comprising: a shank; a bit crown secured to said shank and having a face opposite thereto; and at least one superhard cutting element secured to said crown face; said at least one superhard cutting element comprising a substantially planar table of superhard material having a flat cutting surface and a cutting edge along at least a portion of the periphery of said cutting surface, and a supporting substrate to the rear of said superhard table, the outer lateral dimension of said substrate being substantially the same as that of said superhard table proximate said cutting edge and extending laterally outwardly therefrom from proximate said superhard table.
Claim 42
Dependent Claim
115 words
A fixed-cutter rotary drag bit for drilling subterranean formations, comprising: a shank; a bit crown secured to said shank and having a face opposite thereto; and at least one superhard cutting element secured to said crown face; said at least one superhard cutting element comprising a substantially planar table of superhard material having a flat cutting surface and a cutting edge along at least a portion of the periphery of said cutting surface, and a supporting substrate to the rear of said superhard table, the outer lateral dimension of said substrate being substantially the same as that of said superhard table proximate said cutting edge and extending laterally outwardly therefrom from proximate said superhard table.
Claim 43
Dependent Claim
95 words
A cutting element for a rotary drag bit used in drilling subterranean formations comprising: a substantially planar table of superhard material, said superhard table having a flat cutting surface on one side thereof and a cutting edge bordering said cutting surface along at least a portion of the periphery thereof; and a substrate behind, secured to and supporting said superhard table at a side thereof opposite said cutting surface, said substrate being of substantially the same lateral extent than said superhard table proximate said cutting edge and increasing in lateral extent beyond said cutting edge.
Claim 44
Dependent Claim
95 words
A cutting element for a rotary drag bit used in drilling subterranean formations comprising: a substantially planar table of superhard material, said superhard table having a flat cutting surface on one side thereof and a cutting edge bordering said cutting surface along at least a portion of the periphery thereof; and a substrate behind, secured to and supporting said superhard table at a side thereof opposite said cutting surface, said substrate being of substantially the same lateral extent than said superhard table proximate said cutting edge and increasing in lateral extent beyond said cutting edge.
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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) | 1998-10-23 | 1999-04-24 | 1999-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-23 | 2003-04-24 | 2003-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-23 | 2007-04-24 | 2007-10-24 | $7700.00 | Window Closed / Lapsed |