CPC Subgroup
E21B 17/04 between rod and bit or between rod and rod
Full Title
Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Casings; Tubings > Couplings; joints > between rod and bit or between rod and rod
6 direct subcodes
Child Classifications
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- E21B 17/042 Threaded
- E21B 17/046 with ribs, pins, or jaws, and complementary grooves or the like, e.g. bayonet catches
- E21B 17/05 Swivel joints
- E21B 17/06 Releasing-joints, e.g. safety joints
- E21B 17/07 Telescoping joints for varying drill string lengths; Shock absorbers