E21B3/035 - CPC Classification Index

ClassID:

135123 ⎘

E21B3/035 - CPC Classification

Classification description:

Rotary drilling; Surface drives for rotary drilling with slipping or elastic transmission

Recent Application in this class:

20240418227

2024-12-19

Clutch mechanism for gripping tools

20230020998

2023-01-19

Well drilling tool and method for determining parameter thereof

20220228438

2022-07-21

Mitigation of backward whirl in drill bits

20210079781

2021-03-18

System and method for mitigating stick-slip

20200386055

2020-12-10

Drill bit design selection and use

20200199994

2020-06-25

Controlling drill string rotation

20190257153

2019-08-22

SYSTEM AND METHOD FOR MITIGATING TORSIONAL VIBRATIONS

20180209491

2018-07-26

Downhole tool comprising a rotating part with a torque limiting coupling

20180187539

2018-07-05

Instrumented saver sub for stick-slip vibration mitigation

#10

20180038215

2018-02-08

System and method for mitigating stick-slip

#11

20170247946

2017-08-31

Vibrational damper with removable lugs

#12

20170051562

2017-02-23

Resettable downhole torque limiter and related methods of use

#13

20160138382

2016-05-19

System and method for mitigating stick-slip

#14

20160024862

2016-01-28

System and method for establishing tubular connections

#15

20140151067

2014-06-05

Casing manipulation assembly with hydraulic torque locking mechanism

#16

20110240313

2011-10-06

Resettable downhole torque limiter and related methods of use

#17

16576241

2021-10-12

System, method and apparatus for well string clutch