US5447208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Superhard cutting element having reduced surface roughness and method of modifying
Assignee: Baker Hughes Holdings LLC
•
Filing: 1993-11-22
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Granted: 1995-09-05
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Expires: 2013-11-22
Abstract
Abstract A superhard cutting element having a polished, low friction, substantially planar cutting face with a surface finish roughness of 10 μ in. or less and preferably 0.5 μ in. or less.
Inventors
- 👤 Jeffrey B. Lund
- 👤 Redd H. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:24
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/56; E21B10/567; B; B23; B23B; B23B27/00; B23B27/14; B23B27/141; B23B27/145; B24; B24B; B24B1/00; B24B53/00; B24B53/02; E21B10/5671; B23B2226/00; B23B2226/31; B23B2226/315; Y; Y10; Y10T; Y10T407/00; Y10T407/27
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
41 words
A cutting element for drilling subterranean formations, comprising a substantially planar table of superhard material, said table having a cutting face, at least a portion of which cutting face possesses a surface finish of about 10 μ in. or less roughness.
Claim 2
Dependent Claim
41 words
A cutting element for drilling subterranean formations, comprising a substantially planar table of superhard material, said table having a cutting face, at least a portion of which cutting face possesses a surface finish of about 10 μ in. or less roughness.
Claim 3
Dependent Claim
21 words
The cutting element of claim 1, wherein said cutting face portion surface finish is about 2 μ in. or less roughness.
Claim 4
Dependent Claim
21 words
The cutting element of claim 1, wherein said cutting face portion surface finish is about 0.5 μ in. or less roughness.
Claim 5
Dependent Claim
27 words
The cutting element of claim 1, wherein said substantially planar table comprises a material selected from the group comprising PDC, TSP, diamond film and cubic boron nitride.
Claim 6
Dependent Claim
26 words
The cutting element of claim 1, wherein said cutting face comprises a material selected from the group comprising PDC, TSP, diamond film and cubic boron nitride.
Claim 7
Dependent Claim
15 words
The cutting element of claim 1, further comprising a substrate supporting said substantially planar table.
Claim 8
Dependent Claim
18 words
The cutting element of claim 1, wherein said substantially planar table comprises laterally adjacent segments of superhard material.
Claim 9
Dependent Claim
13 words
The cutting element of claim 7, wherein said cutting element comprises a blade.
Claim 10
Dependent Claim
33 words
The cutting element of claim 1, wherein said cutting face has a peripheral cutting edge, at least a portion of which possesses a surface finish of about 10 μ in. or less roughness.
Claim 11
Dependent Claim
37 words
The cutting element of claim 1, wherein said cutting face has a peripheral cutting edge having a chamfer, at least a portion of which chamfer possesses a surface finish of about 10 μ in. or less roughness.
Claim 12
Dependent Claim
78 words
A rotary drag bit for drilling subterranean formations, comprising: a bit body having a shank secured thereto for connection of said rotary drag bit to a drill string; a face on said bit body; a plurality of superhard cutting elements disposed on said bit body face, at least one of said superhard cutting elements having a substantially planar superhard cutting face including at least a portion with a surface finish of about 10 μ in. or less roughness.
Claim 13
Dependent Claim
78 words
A rotary drag bit for drilling subterranean formations, comprising: a bit body having a shank secured thereto for connection of said rotary drag bit to a drill string; a face on said bit body; a plurality of superhard cutting elements disposed on said bit body face, at least one of said superhard cutting elements having a substantially planar superhard cutting face including at least a portion with a surface finish of about 10 μ in. or less roughness.
Claim 14
Dependent Claim
19 words
The rotary drag bit of claim 11, wherein said surface finish is about 2 μ in. or less roughness.
Claim 15
Dependent Claim
19 words
The rotary drag bit of claim 11, wherein said surface finish is about 5 μ in. or less roughness.
Claim 16
Dependent Claim
39 words
A cutting element for drilling subterranean formations, comprising a mass of superhard material defining a substantially planar cutting face, said cutting face having at least a portion with a surface finish of about 10 μ in. or less roughness.
Claim 17
Dependent Claim
39 words
A cutting element for drilling subterranean formations, comprising a mass of superhard material defining a substantially planar cutting face, said cutting face having at least a portion with a surface finish of about 10 μ in. or less roughness.
Claim 18
Dependent Claim
18 words
The cutting element of claim 14, wherein said surface finish is about 2 μ in. or less roughness.
Claim 19
Dependent Claim
18 words
The cutting element of claim 14, wherein said surface finish is about 5 μ in. or less roughness.
Claim 20
Dependent Claim
25 words
The cutting element of claim 14, wherein said mass comprises a material selected from the group comprising PDC, TSP, diamond film and cubic boron nitride.
Claim 21
Dependent Claim
26 words
The cutting element of claim 14, wherein said cutting face comprises a material selected from the group comprising PDC, TSP, diamond film and cubic boron nitride.
Claim 22
Dependent Claim
14 words
The cutting element of claim 14, further comprising a substrate supporting said superhard mass.
Claim 23
Dependent Claim
16 words
The cutting element of claim 14, wherein said mass comprises laterally adjacent segments of superhard material.
Claim 24
Dependent Claim
13 words
The cutting element of claim 20, wherein said cutting element comprises a blade.
Claim 25
Dependent Claim
33 words
A cutting element comprising a table of superhard material supported by a substrate and having a substantially planar cutting face, at least a portion of which is polished to a substantial mirror finish.
Claim 26
Dependent Claim
33 words
A cutting element comprising a table of superhard material supported by a substrate and having a substantially planar cutting face, at least a portion of which is polished to a substantial mirror finish.
Claim 27
Dependent Claim
27 words
The cutting element of claim 22, wherein said cutting face is formed of material selected from the group comprising PDC, TSP, diamond film and cubic boron nitride.
Claim 28
Independent Claim
48 words
A method of modifying a superhard cutting element having a superhard cutting face with a surface finish in the range of about 20-40 μ in., comprising smoothing and polishing at least a portion of said cutting face to a surface finish of about 10 μ in. or less.
Claim 29
Independent Claim
48 words
A method of modifying a superhard cutting element having a superhard cutting face with a surface finish in the range of about 20-40 μ in., comprising smoothing and polishing at least a portion of said cutting face to a surface finish of about 10 μ in. or less.
Claim 30
Dependent Claim
22 words
The method of claim 24, further comprising lapping said cutting face to a surface finish of about 2 μ in. or less.
Claim 31
Dependent Claim
22 words
The method of claim 24, further comprising lapping said cutting face to a surface finish of about 0.5 μ in. or less.
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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) | 1998-09-04 | 1999-03-06 | 1999-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-09-04 | 2003-03-06 | 2003-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-09-04 | 2007-03-06 | 2007-09-05 | $7700.00 | Window Closed / Lapsed |