Global Patent Index - EP 0991490 A1

EP 0991490 A1 2000-04-12 - METHOD FOR IMPROVING WEAR RESISTANCE OF ABRASIVE TOOLS

Title (en)

METHOD FOR IMPROVING WEAR RESISTANCE OF ABRASIVE TOOLS

Title (de)

METHODE ZUM VERBESSERUNG VERSCHLEISSWIEDERSTAND VON SCHLEIFWERKZEUGEN

Title (fr)

PROCEDE D'AUGMENTATION DE LA RESISTANCE A L'USURE D'OUTILS ABRASIFS

Publication

EP 0991490 A1 (EN)

Application

EP 98930324 A

Priority

  • US 9812602 W
  • US 87738297 A
  • US 9589198 A

Abstract (en)

[origin: WO9857771A1] A drill bit (10) is provided with a cylindrical body portion (24) fabricated from a plastic material. The body portion is fastened in concentric, end to end relation to a cylindrical cutter (12) fabricated from a metallic material and having an array of cutting elements (16) disposed thereon. The body portion and cutter are preferably tubular, wherein the cutting elements are disposed in an annular array, to facilitate core or crown drilling operations.

IPC 1-7 (main, further and additional classification)

B23B 51/04; B23B 31/00; B28D 1/04

IPC 8 full level (invention and additional information)

B23B 31/00 (2006.01); B23B 51/04 (2006.01); B28D 1/04 (2006.01); B28D 1/14 (2006.01)

CPC (invention and additional information)

B23B 31/005 (2013.01); B23B 51/0426 (2013.01); B28D 1/041 (2013.01); B23B 2226/61 (2013.01); B23B 2231/0228 (2013.01); B23B 2251/02 (2013.01)

Citation (search report)

See references of WO 9857771A1

Designated contracting state (EPC)

AT BE CH DE ES FI FR GB IT LI NL SE

EPO simple patent family

WO 9857771 A1 19981223; AU 727957 B2 20010104; AU 7973998 A 19990104; BR 9810048 A 20000919; CA 2291279 A1 19981223; CN 1105614 C 20030416; CN 1260741 A 20000719; EP 0991490 A1 20000412; ID 24113 A 20000706; JP 2001527469 A 20011225; NZ 501168 A 20010629

INPADOC legal status


2008-02-13 [18D] APPLICATION DEEMED TO BE WITHDRAWN

- Effective date: 20070825

2007-07-18 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20040521

2004-07-07 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20040521

2000-04-12 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000117

2000-04-12 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH DE ES FI FR GB IT LI NL SE