E21B10/345 - CPC Classification Index

ClassID:

135230 ⎘

E21B10/345 - CPC Classification

Classification description:

Drill bits; Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools of roller-cutter type cutter shifted by fluid pressure

Recent Application in this class:

20230279729

2023-09-07

ADJUSTABLE DRILL STRING REAMER

20230167691

2023-06-01

Radial cutting assembly for drilling tool

20220170326

2022-06-02

Rock crushing unit for widening a pilot hole made on rocky terrain

20210301597

2021-09-30

Deploying material to limit losses of drilling fluid in a wellbore

20200308921

2020-10-01

Compression-set straddle packer with fluid pressure-boosted packer set

20200240215

2020-07-30

Underreamer

20190292897

2019-09-26

Supporting a string within a wellbore with a smart stabilizer

20190292896

2019-09-26

Opening a wellbore with a smart hole-opener

20180119528

2018-05-03

Downhole perforating tools and methods

#10

20170350194

2017-12-07

Wellbore tool reamer assembly

#11

20170037698

2017-02-09

Packer apparatus and method of sealing well casing

#12

20150267513

2015-09-24

Downhole perforating tool and method of use

#13

20130175035

2013-07-11

Packer apparatus

#14

20120175168

2012-07-12

Downhole expandable roller bearing apparatus

#15

20120168229

2012-07-05

Expandable downhole tool apparatus