EP 0955446 A2 19991110 - Preform cutting element
Title (en)
Preform cutting element
Title (de)
Vorgeformtes Schneidelement
Title (fr)
Elément de coupe préformé
Publication
Application
Priority
GB 9809690 A 19980508
Abstract (en)
A preform cutting element, for use in a drag-type drill bit, includes a facing table (10) of polycrystalline diamond having a front face (12), a peripheral surface (13), and a rear surface (14) bonded to the front face of a tungsten carbide substrate (11). The rear face (14) ofthe diamond facing table is integrally formed with a single protuberance (19), adjacent the periphery ofthe element, which extends into a correspondingly shaped recess in the substrate (11). <IMAGE>
IPC 1-7
IPC 8 full level
E21B 10/56 (2006.01); E21B 10/567 (2006.01); E21B 10/573 (2006.01)
CPC (source: EP)
E21B 10/5676 (2013.01); E21B 10/5735 (2013.01)
Citation (applicant)
- US 5120327 A 19920609 - DENNIS MAHLON D [US]
- US 4784023 A 19881115 - DENNIS MAHLON D [US]
- GB 2283772 A 19950517 - CAMCO DRILLING GROUP LTD [GB]
- GB 2283773 A 19950517 - CAMCO DRILLING GROUP LTD [GB]
- GB 2290326 A 19951220 - CAMCO DRILLING GROUP LTD [GB]
- GB 2299109 A 19960925 - CAMCO DRILLING GROUP LTD [GB]
- GB 2290328 A 19951220 - CAMCO DRILLING GROUP LTD [GB]
- GB 2300016 A 19961023 - CAMCO DRILLING GROUP LTD [GB]
- GB 2305449 A 19970409 - CAMCO DRILLING GROUP LTD [GB]
Designated contracting state (EPC)
BE DE FR IE IT
DOCDB simple family (publication)
EP 0955446 A2 19991110; EP 0955446 A3 20000816; EP 0955446 B1 20040728; DE 69918891 D1 20040902; DE 69918891 T2 20050804; GB 2337063 A 19991110; GB 9809690 D0 19980701; GB 9910223 D0 19990630
DOCDB simple family (application)
EP 99303483 A 19990504; DE 69918891 T 19990504; GB 9809690 A 19980508; GB 9910223 A 19990505