Patents-Review.com
ClassID:

135204 ⎘

E21B10/04 - CPC Classification

Classification description:

Drill bits; Core bits with core destroying means

Recent Application in this class:
#1
20250334007
2025-10-30

Continuous Sampling Drill Bit

 #2
20240003192
2024-01-04

Continuous Sampling Drill Bit

 #3
20230358103
2023-11-09

CONTINUOUS SAMPLING DRILL BIT

 #4
20220290501
2022-09-15

Continuous sampling drill bit

 #5
20210246731
2021-08-12

HYBRID DRILL BIT

 #6
20210246729
2021-08-12

Drill bit with joint function of induced unloading and abrasive jet and drilling method thereof

 #7
20210230943
2021-07-29

Drilling boreholes with a hybrid bit

 #8
20210054695
2021-02-25

Continuous sampling drill bit

 #9
20190063157
2019-02-28

Downhole drilling tool system of torque self-balancing

 #10
20190048674
2019-02-14

Core drilling methods and devices

 #11
20180266182
2018-09-20

Drilling a rock formation with a drill bit assembly-with electrodes

 #12
20170058608
2017-03-02

Rock formation drill bit assembly with electrodes

 #13
20150368976
2015-12-24

FIXED-CUTTER DRILL BITS GENERATING CORES

 #14
20140291034
2014-10-02

Coring apparatus and methods to use the same

 #15
20130228382
2013-09-05

Inner gauge ring drill bit

 #16
20130020134
2013-01-24

Fixed cutter drill bit with core fragmentation feature

 #17
20120273275
2012-11-01

Method and apparatus for dual speed, dual torque drilling

 #18
20100101870
2010-04-29

Combination coring bit and drill bit using fixed cutter PDC cutters

 #19
20090107724
2009-04-30

METHOD AND APPARATUS FOR CONTINUOUS FORMATION SAMPLING AND ANALYSIS DURING WELLBORE DRILLING

 #20
20060196699
2006-09-07

Modular kerfing drill bit

 #21
16544333
2020-04-21

Continuous sampling drill bit