Global patent index - EP 0885703 A4

EP 0885703 A4 2000-01-12 - DISCHARGE HYDRAULIC PRESSURE DESTROYING METHOD

Title (en)

DISCHARGE HYDRAULIC PRESSURE DESTROYING METHOD

Title (de)

VERFAHREN ZUM HYDRAULISCHEN BRECHEN VON GESTEIN

Title (fr)

PROCEDE DE DESTRUCTION PAR PRESSION HYDRAULIQUE DE REFOULEMENT

Publication

EP 0885703 A4 (EN)

Application

EP 96925129 A

Priority

  • JP 9602140 W
  • JP 19441195 A
  • JP 19441295 A
  • JP 19441395 A

Abstract (en)

[origin: EP0885703A1] A method of destroying an object to be destroyed (1) having only one free surface (F1) by using an electric discharge hydraulic pressure destroying tool comprises the steps of forming a pilot hole (11) in a first free surface (F1) to use the inner surface thereof as a second free surface (F2), forming a destroy hole (12-1) at one place in the first free surface (F1) in the periphery of the pilot hole (11), installing an electric discharge hydraulic pressure destroying tool (3) in the destroy hole (12-1) to destroy the object (1) by electric discharge destruction to widen the destroy hole so as to enlarge the second free surface continuous with the pilot hole (hole) in the periphery of the pilot hole (11), forming a second destroy hole (12-2) parallel with the pilot hole (11) in the periphery of the pilot hole (11), and destroying the object (1) by electric discharge destruction effected by an electric discharge hydraulic pressure destroying tool (13) installed in the destroy hole (12-2), said steps being repeated to gradually widen the pilot hole (11). <IMAGE>

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

B28D 1/00; E21C 37/18

IPC 8 full level (invention and additional information)

E21C 37/18 (2006.01); B28D 1/00 (2006.01); E21C 37/06 (2006.01)

CPC (invention and additional information)

B28D 1/00 (2013.01); E21C 37/06 (2013.01)

Designated contracting state (EPC)

CH DE FR GB LI

EPO simple patent family

EP 0885703 A1 19981223; EP 0885703 A4 20000112; CN 1075430 C 20011128; CN 1191504 A 19980826; RU 2139990 C1 19991020; WO 9704934 A1 19970213

INPADOC legal status

2002-08-21 [18W] WITHDRAWN

- Date of withdrawal: 20020628

2002-05-22 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20020404

2000-01-12 [A4] SUPPLEMENTARY SEARCH REPORT

- Effective date: 19991125

2000-01-12 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A4

- Designated State(s): CH DE FR GB LI

1998-12-23 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 19980302

1998-12-23 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): CH DE FR GB LI