EP 2050922 B1 20230111 - Thread for roto-percussion drill pipe
Title (en)
Thread for roto-percussion drill pipe
Title (de)
Gewinde für Dreh-Schlag-Bohrrohr
Title (fr)
Filetage pour tube de forage roto-percussion
Publication
Application
Priority
IT MI20071992 A 20071016
Abstract (en)
[origin: EP2050922A2] A roto-percussion pipe, comprising a tubular portion having at its ends a female coupling carrying a female thread, and a male coupling carrying a male thread, said male coupling and female coupling enabling the pipe to be connected to other pipes identical therewith to form a roto-percussion drill string of the required length, said threads having at least three starts.
IPC 8 full level
E21B 17/042 (2006.01); F16L 15/06 (2006.01)
CPC (source: EP)
E21B 17/0423 (2013.01); E21B 17/0426 (2013.01)
Citation (examination)
- US 4858294 A 19890822 - HOLLOX GRAHAM E [GB]
- US 2004226754 A1 20041118 - NORDFELDT LEIF [SE]
- US 2007029290 A1 20070208 - KEHRER OSKAR [AT]
- DE 3427837 A1 19860206 - FORD WERKE AG [DE]
- US 2005087581 A1 20050428 - OTTEN GREGORY K [US], et al
- US 3268248 A 19660823 - CHAMBERS JAMES W
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
DOCDB simple family (publication)
EP 2050922 A2 20090422; EP 2050922 A3 20170308; EP 2050922 B1 20230111; ES 2937164 T3 20230324; IT MI20071992 A1 20090417
DOCDB simple family (application)
EP 08166631 A 20081015; ES 08166631 T 20081015; IT MI20071992 A 20071016