E21B7/001 - CPC Classification Index

ClassID:

135148 ⎘

E21B7/001 - CPC Classification

Classification description:

Special methods or apparatus for drilling Drilling a non circular hole

Recent Application in this class:

20230323735

2023-10-12

Diaphragm wall down-the-hole hammer trenching machine and use method thereof

20220228440

2022-07-21

Square pile construction method and equipment of a rotary drilling rig

20220178589

2022-06-09

Method of deploying a heat exchanger pipe

20220170825

2022-06-02

In-situ square sample acquisition device and method for bond contact test of surrounding rock and a shotcrete layer

20190292853

2019-09-26

Borehole cross-section steering

20190145666

2019-05-16

Method of deploying a heat exchanger pipe

20160230523

2016-08-11

MECHANIZED SLOT DRILLING

20150096806

2015-04-09

MECHANIZED SLOT DRILLING

20130032406

2013-02-07

Systems and methods for drilling boreholes with noncircular or variable cross-sections

#10

20110259641

2011-10-27

Apparatus and method for modifying the sidewalls of a borehole

#11

20110220409

2011-09-15

METHOD AND DEVICE FOR FUSION DRILLING

#12

20110174537

2011-07-21

Method and System for Forming a Non-Circular Borehole

#13

20100032207

2010-02-11

Method and System for Forming a Non-Circular Borehole

#14

20090032306

2009-02-05

Method of Drilling a Stable Borehole

#15

20080093125

2008-04-24

Method and System for Forming a Non-Circular Borehole

#16

20080008534

2008-01-10

Method of rehabilitating soil and/or underground water, and equipment for implementing the method