Patents-Review.com
ClassID:

136301 ⎘

E21F15/00 - CPC Classification

Classification description:

Methods or devices for placing filling-up materials in underground workings

Sub-classes:
Recent Application in this class:
#1
20250163804
2025-05-22

METHOD FOR RECOVERING RESIDUAL COAL PILLARS BY FREEZING WATER ACCUMULATED IN ROOM-AND-PILLAR MINING AREA

 #2
20240301782
2024-09-12

METHOD FOR REMINING RESIDUAL COAL PILLAR IN RESIDUAL MINING AREA BY COLLABORATION OF PILLAR-SIDE BACKFILLING AND IN-SITU GASIFICATION

 #3
20240209734
2024-06-27

I-patterned filling method for initial stage of coal mining based on roof fracture feature characteritics

 #4
20230243259
2023-08-03

Microwave-mechanical fluidization mining system and mining method for metal mines

 #5
20210404337
2021-12-30

SYNERGISTIC MINING METHOD FOR UNDERGROUND MINING, SEPARATION AND FILLING FOR A CLOSE DISTANCE COAL SEAM GROUP

 #6
20210148228
2021-05-20

MINE EXPLOITATION, SEPARATION AND FILING, AND X EXPLOITATION

 #7
20200408094
2020-12-31

Mine exploitation based on stoping, separation and filling control

 #8
20200378255
2020-12-03

Internally injected replacement support room-type coal pillar recovery method

 #9
20200300090
2020-09-24

Method for controlling subsidence area caused by underground mining in adjoining open-pit mine

 #10
20200232323
2020-07-23

Multi-section non-pillar staggered protected roadway for deep inclined thick coal seam and method for coal pillar filling between sections

 #11
20190359880
2019-11-28

Compressive grout mix for use in absorbing compressive or deformation stresses of subterranean formations

 #12
20190301283
2019-10-03

Method for recovering room-mining coal pillars by solid filling in synergy with artificial pillars

 #13
20190032486
2019-01-31

System and method for forming a cavity in a backfilled stope

 #14
20180314770
2018-11-01

Method for designing supporting parameters of transition support for mixed mining face of filling and fully-mechanized mining

 #15
20180195386
2018-07-12

PARALLEL DIGGING, MINING AND FILLING OPERATION COAL MINING METHOD FOR CONTROLLING OVERLAYING STRATA FRACTURE AND SURFACE SUBSIDENCE

 #16
20180037801
2018-02-08

Compressible grout mix for use in absorbing compressive or deformation stresses of subterranean formations

 #17
20180003316
2018-01-04

Pressure control apparatus

 #18
20170314721
2017-11-02

Method for packing filler material

 #19
20170184389
2017-06-29

Device and method for detecting wall abrasion of solid filler feeding well

 #20
20160348507
2016-12-01

Water-preserved-mining roof-contacted filling method for controlling fissure of overlying strata and surface subsidence

 #21
20160305245
2016-10-20

Skip-mining type wangeviry stope branch roadway filling and coal mining method

 #22
20150322788
2015-11-12

Apparatus and method for storing waste material

 #23
20150097413
2015-04-09

Apparatus and method for storing waste material

 #24
20140056646
2014-02-27

Apparatus and method for mining coal

 #25
20130240210
2013-09-19

Systems and methods for injecting a particulate mixture

 #26
20050218711
2005-10-06

Method and means for recovering hydrocarbons from oil sands by underground mining

 #27
19232933
2025-09-16

Methods for grout injection repair and water retention in goaf

 #28
18912998
2025-05-27

Method of segmented grouting for repairing aquifers in mining area