Patent US5598750A successfully refreshed from Google Patents.
US5598750A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elements faced with superhard material
Assignee: ReedHycalog UK Ltd
•
Filing: 1994-11-09
•
Granted: 1997-02-04
•
Expires: 2014-11-09
Abstract
Abstract A preform element, such as a cutting element for a drag-type drill bit, includes a facing table of superhard material having a front cutting face, a peripheral surface, and a rear surface bonded to a substrate which is less hard than the superhard material. The rear surface of the facing table is integrally formed with a plurality of protuberances, such as ribs or studs, which project into the substrate. The depth to which the protuberances project into the substrate varies in irregular manner across the facing table, so as to inhibit the propagation of cracks across the substrate to the rear of the facing table.
Inventors
- 👤 Nigel D. Griffin
- 👤 T. Alex Newton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:03
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/56; E21B10/567; E21B10/573; E21B10/5735; B; B23; B23B; B23B27/00; B23B27/14; B23B27/141; B23B27/145; B23B27/146; B24; B24D; B24D3/00; B24D3/001; E21B17/00; E21B17/10; E21B17/1092; B23B2222/00; B23B2222/28; B23B2226/00; B23B2226/12; B23B2226/125; B23B2226/31; B23B2226/315; Y; Y10; Y10S; Y10S76/00; Y10S76/06; Y10S76/12
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
124 words
A preform composite compact element including a facing table of superhard material having a front cutting face, a peripheral surface, and a rear surface bonded to a substrate which is less hard than the superhard material, the facing table and substrate having been bonded together during forming of the element in a high pressure, high temperature forming press, the rear surface of the facing table being integrally formed with a plurality of protuberances which project into the substrate, the depth to which at least certain of said protuberances project into the substrate varying in irregular manner across the facing table, and there being an imaginary surface extending across the substrate and connecting the rearward extremities of the protuberances, which surface is non-planar and discontinuous.
Claim 2
Dependent Claim
124 words
A preform composite compact element including a facing table of superhard material having a front cutting face, a peripheral surface, and a rear surface bonded to a substrate which is less hard than the superhard material, the facing table and substrate having been bonded together during forming of the element in a high pressure, high temperature forming press, the rear surface of the facing table being integrally formed with a plurality of protuberances which project into the substrate, the depth to which at least certain of said protuberances project into the substrate varying in irregular manner across the facing table, and there being an imaginary surface extending across the substrate and connecting the rearward extremities of the protuberances, which surface is non-planar and discontinuous.
Claim 3
Dependent Claim
35 words
A preform element according to claim 1, wherein the facing table comprises a front portion having a substantially planar rear surface, said protuberances extending from said rear surface and into the substrate to different depths.
Claim 4
Dependent Claim
21 words
A preform element according to claim 2, wherein the protuberances are spaced apart across the rear surface of the facing table.
Claim 5
Dependent Claim
34 words
A preform element according to claim 2, wherein the protuberances are disposed in close side-by-side relationship and reduce in width, so as to provide clearances between adjacent protuberances, as they extend into the substrate.
Claim 6
Dependent Claim
20 words
A preform element according to claim 2, wherein the protuberances are disposed in a regular pattern across the facing table.
Claim 7
Dependent Claim
16 words
A preform element according to claim 2, wherein the protuberances are arranged in an irregular manner.
Claim 8
Dependent Claim
15 words
A preform element according to claim 2, wherein the protuberances are of generally stud-like form.
Claim 9
Dependent Claim
18 words
A preform element according to claim 2, wherein the protuberances are generally in the form of elongate ribs.
Claim 10
Dependent Claim
15 words
A preform element according to claim 7, wherein the protuberances are of substantially circular cross-section.
Claim 11
Dependent Claim
15 words
A preform element according to claim 7, wherein the protuberances are of irregular cross-sectional shape.
Claim 12
Dependent Claim
13 words
A preform element according to claim 8, wherein the ribs are substantially straight.
Claim 13
Dependent Claim
12 words
A preform element according to claim 8, wherein the ribs are curved.
Claim 14
Dependent Claim
14 words
A preform element according to claim 8, wherein the ribs are of irregular shape.
Claim 15
Dependent Claim
18 words
A preform element according to claim 8, wherein the depth of each rib varies along the length thereof.
Claim 16
Dependent Claim
18 words
A preform element according to claim 8, wherein the width of each rib varies along the length thereof.
References Cited (Backward Citations)
US4109737A
Cited
US4629373A
Cited
US4784023A
Cited
US5011515B1
Cited
US5011515A
Cited
EP0462091A1
Cited
EP0462955A1
Cited
US5120327A
Cited
GB2273306A
Cited
EP0601840A1
Cited
EP0604211A1
Cited
GB2275068A
Cited
US5351772A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-02-04 | 2000-08-05 | 2001-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-02-04 | 2004-08-05 | 2005-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-02-04 | 2008-08-05 | 2009-02-04 | $7700.00 | Window Closed / Lapsed |