ClassID:

135728

E21B49/025 - CPC Classification

Classification description:

Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells by mechanically taking samples of the soil of underwater soil, e.g. with grab devices

Recent Application in this class:
#1
20250354443
2025-11-20

GEOTECHNICAL RIG SYSTEMS AND METHODS

#2
20240254844
2024-08-01

GEOTECHNICAL RIG SYSTEMS AND METHODS

#3
20230228160
2023-07-20

Geotechnical rig systems and methods

#4
20230160304
2023-05-25

METHOD AND SYSTEM FOR PREDICTING RELATIVE PERMEABILITY CURVE BASED ON MACHINE LEARNING

#5
20220042894
2022-02-10

Geotechnical rig systems and methods

#6
20220018196
2022-01-20

Geotechnical rig systems and methods

#7
20220003062
2022-01-06

Underwater drilling device and method for procuring drill cores of a bed of a body of water

#8
20210246728
2021-08-12

Dual rotary elevating geotechnical drill

#9
20210140258
2021-05-13

Device, system and method for collecting samples from a bed of a waterbody

#10
20200248518
2020-08-06

Pressure-retaining cap screwing and unscrewing device for marine natural gas hydrate pressure-retaining rock-core barrel

#11
20180372611
2018-12-27

Apparatus and method for measuring apparent permeability of tight rock core

#12
20180306009
2018-10-25

Modeling method for gas production of CBM reservoir rocks

#13
20180143104
2018-05-24

Sample collection apparatus

#14
20170152719
2017-06-01

Underwater drilling device and method for procuring and analyzing ground samples of a bed of a body of water

#15
20160153869
2016-06-02

Silty floating mud collection device

#16
20160003038
2016-01-07

Determining Gas Content of a Core Sample

#17
20150337611
2015-11-26

Method, handling unit and stand for acquiring a sample from a seabed top layer

#18
20150176404
2015-06-25

Apparatus and Method for Subsea Testing

#19
20140158434
2014-06-12

Sediment coring apparatus for preventing loss and disturbance of sample in core

#20
20140144255
2014-05-29

Compound sample extraction apparatus

#21
20120261191
2012-10-18

Determining methane content of a bottom sample

#22
20110232138
2011-09-29

Apparatus for collecting marine deposits

#23
20110198125
2011-08-18

Percussive driving apparatus for environmental sampling or test device

#24
20100238025
2010-09-23

Sea floor sampling device and method

#25
20070246620
2007-10-25

Movable supporting construction

#26
20050106751
2005-05-19

Core sample collector equipped with sterilizing agent-applying mechanism and method of taking core sample