ClassID:

135483

E21B33/085 - CPC Classification

Classification description:

Sealing or packing boreholes or wells; Surface sealing or packing; Wipers; Oil savers Rotatable packing means, e.g. rotating blow-out preventers

Recent Application in this class:
#1
20260078639
2026-03-19

WIRELESS WEAR DETECTION FOR SEALING ELEMENTS

#2
20260063024
2026-03-05

SYSTEMS AND METHODS FOR IMPROVED WEIGHT-ON-BIT ACCURACY DURING DRILLING

#3
20260055696
2026-02-26

MEASURING DRILL PIPE ALIGNMENT IN ROTATING CONTROL DEVICE SYSTEM

#4
20260036013
2026-02-05

CONTROL SYSTEMS AND METHODS FOR RCD ACTIVE PRESSURE COMPENSATION

#5
20260036011
2026-02-05

SYSTEM AND APPARATUS FOR BLOW OUT PREVENTER COMPONENTS AND STRING PROTECTION

#6
20260009305
2026-01-08

ROTATING CONTROL DEVICE

#7
20250369305
2025-12-04

WELLBORE BALANCED PRESSURE COMPENSATION FOR ROTATING CONTROL DEVICE (RCD) ROTARY SEALS

#8
20250270928
2025-08-28

FORMATION TESTING WITH CONTROLLED PRESSURE DRILLING

#9
20250154847
2025-05-15

Rotating Control Device Retaining Mechanism

#10
20250129685
2025-04-24

RCD HOUSING AND COUPLING METHOD

#11
20250092755
2025-03-20

RISERLESS MARINE PACKAGE

#12
20250084714
2025-03-13

SPACER SPOOL WITH RETURN LINE TO CONNECT RIG BLOW OUT PREVENTOR TO MANAGED PRESSURE DRILLING CHOKE

#13
20250075583
2025-03-06

MONITORING OPERATION OF A ROTATING CONTROL DEVICE

#14
20250075582
2025-03-06

Monitoring operation of a rotating control device

#15
20250067142
2025-02-27

PREDICTIVE WEAR MODELING FOR ACTIVELY CONTROLLED SEALING ELEMENT

#16
20240410247
2024-12-12

Powered clamp closure mechanism

#17
20240352804
2024-10-24

WIRELESS WEAR DETECTION FOR SEALING ELEMENTS

#18
20240309711
2024-09-19

Downhole swivel apparatus and method

#19
20240301761
2024-09-12

WASHPIPE ASSEMBLY

#20
20240287865
2024-08-29

Powered clamp assembly

#21
20240229593
2024-07-11

Drill ahead rotating control device methodology and system

#22
20240200421
2024-06-20

Rotating control device having improved seal

#23
20240093566
2024-03-21

Rotating Control Device Clamping Mechanism

#24
20240084664
2024-03-14

SEAL ASSEMBLY FOR A ROTATING CONTROL DEVICE

#25
20230287754
2023-09-14

ROTATING CONTROL DEVICE

#26
20230265733
2023-08-24

Installing a shooting nipple on a rotating control device

#27
20230258056
2023-08-17

Rotating control device with integrated cooling for sealed bearings

#28
20230151700
2023-05-18

Downhole swivel apparatus and method

#29
20230110604
2023-04-13

POWERED CLAMP CLOSURE MECHANISM

#30
20230039966
2023-02-09

Locking clamp for a rotating control device

#31
20220403709
2022-12-22

WELL CONTROL SYSTEM AND METHOD OF USE

#32
20220389785
2022-12-08

Seal elements for annular control devices

#33
20220381105
2022-12-01

APPARATUS AND METHOD RELATING TO MANAGED PRESSURE DRILLING (MPD) WHILST USING A SUBSEA RCD SYSTEM

#34
20220325596
2022-10-13

Rod lock out clamp

#35
20220316289
2022-10-06

Downhole mechanical actuator

#36
20220235800
2022-07-28

Rotating head with bypass circuit

#37
20220205335
2022-06-30

Apparatus and method relating to managed pressure drilling

#38
20220186580
2022-06-16

Pressure compensation piston for dynamic seal pressure differential minimization

#39
20220179120
2022-06-09

Detecting drill pipe connection joints via magnetic flux leakage

#40
20220136345
2022-05-05

MPD-capable flow spools

#41
20220120156
2022-04-21

Rotating control device for jackup rigs

#42
20220106851
2022-04-07

Dual hardness sealing elements for blowout preventer

#43
20220074280
2022-03-10

Rotating control device system

#44
20220065066
2022-03-03

Rotating control device systems and methods

#45
20220034171
2022-02-03

Downhole swivel apparatus and method

#46
20220003112
2022-01-06

Methods for assessing the reliability of hydraulically-actuated devices and related systems

#47
20210372222
2021-12-02

Rotating control device system with rams

#48
20210348470
2021-11-11

Rotating control device system

#49
20210340835
2021-11-04

Drill string circulation apparatus

#50
20210340834
2021-11-04

Rotary control device with self-contained hydraulic reservoir

#51
20210324700
2021-10-21

Rotating control device systems and methods

#52
20210317737
2021-10-14

Methods for assessing the reliability of hydraulically-actuated devices and related systems

#53
20210277739
2021-09-09

Blowout preventer with dual function rams

#54
20210277727
2021-09-09

Rotating control device, and installation and retrieval thereof

#55
20210254427
2021-08-19

SEAL ELEMENTS FOR ANNULAR CONTROL DEVICES

#56
20210246755
2021-08-12

Static annular sealing systems and integrated managed pressure drilling riser joints for harsh environments

#57
20210246754
2021-08-12

Rotating control device for jackup rigs

#58
20210207447
2021-07-08

Rotating control device for land rigs

#59
20210198971
2021-07-01

Wellhead torque ring

#60
20210189828
2021-06-24

Riser adapter quick connection assembly

#61
20210189826
2021-06-24

Iris valve type well annular pressure control device and method

#62
20210131205
2021-05-06

Rotating control device

#63
20210123316
2021-04-29

Rotating diverter head with remote controlled clamping system

#64
20210115748
2021-04-22

TOPICAL COMPOSITIONS AND METHODS OF TREATMENT

#65
20210115738
2021-04-22

Integral dsit and flow spool

#66
20210062588
2021-03-04

Locking clamp for a rotating control device

#67
20210017818
2021-01-21

Downhole swivel apparatus and method

#68
20200399972
2020-12-24

Wellhead sealing device of sucker-rod pumping machine

#69
20200362659
2020-11-19

Rotating control device for jackup rigs

#70
20200362651
2020-11-19

Rotating control device for land rigs

#71
20200347685
2020-11-05

MPD-capable flow spools

#72
20200340326
2020-10-29

Rotating control device with cooling mandrel

#73
20200325737
2020-10-15

Rotating control device with flexible sleeve

#74
20200300052
2020-09-24

Seal condition monitoring

#75
20200300051
2020-09-24

Seal condition monitoring

#76
20200232297
2020-07-23

Rotating control device with multiple seal cartridge

#77
20200232286
2020-07-23

Integral DSIT and flow spool

#78
20200190924
2020-06-18

CHOKE SYSTEM

#79
20200182006
2020-06-11

Rotating Control Device with Mechanical Seal

#80
20200182002
2020-06-11

Large width diameter riser segment lowerable through a rotary of a drilling rig

#81
20200157911
2020-05-21

Rotating Control Device Clamping Mechanism

#82
20200157910
2020-05-21

Smart rotating control device apparatus and system

#83
20200115987
2020-04-16

TOPICAL COMPOSITIONS AND METHODS OF TREATMENT

#84
20200056441
2020-02-20

Continuous circulation system for rotational drilling

#85
20200040690
2020-02-06

Rotating control device having locking pins for locking a bearing assembly

#86
20200040689
2020-02-06

Rotating control device having a locking block system

#87
20200040688
2020-02-06

Rotating control device having an anti-rotation locking system

#88
20190323299
2019-10-24

Pressure control device for use with a subterranean well

#89
20190316424
2019-10-17

Downhole swivel apparatus and method

#90
20190309581
2019-10-10

ROTATING AND RECIPROCATING SWIVEL APPARATUS AND METHOD

#91
20190277090
2019-09-12

Sealing system for downhole tool

#92
20190234173
2019-08-01

Rotating Control Devices and Methods to Detect Pressure Within Rotating Members

#93
20190211666
2019-07-11

Seal Integrity Verification System for Riser Deployed RCD

#94
20190195032
2019-06-27

RISER GAS HANDLING SYSTEM AND METHOD OF USE

#95
20190162042
2019-05-30

Sealing element wear indicator system

#96
20190162041
2019-05-30

PRESSURE CONTROL DEVICE WITH COMPOSITE ANNULAR SEAL ASSEMBLY

#97
20190136655
2019-05-09

Mechanical rotating control device latch assembly

#98
20190112897
2019-04-18

Pressure equalization for well pressure control device

#99
20190112890
2019-04-18

Seal arrangement for rotating equipment

#100
20190112886
2019-04-18

Installation and retrieval of well pressure control device releasable assembly

#101
20190100988
2019-04-04

Pipe tally vision system

#102
20190093445
2019-03-28

SYSTEMS AND METHODS FOR CONTROLLING FLOW FROM A WELLBORE ANNULUS

#103
20190093442
2019-03-28

Pressure control device, and installation and retrieval of components thereof

#104
20190063176
2019-02-28

Seal housing with flange collar, floating bushing, seal compressor, floating polished rod, and independent fluid injection to stacked dynamic seals, and related apparatuses and methods of use

#105
20190055791
2019-02-21

Subsea rotating control device apparatus having debris barrier

#106
20190024474
2019-01-24

Latch assembly using on-board miniature hydraulics for RCD applications

#107
20190024473
2019-01-24

ROTATING ANNULAR PREVENTER AND METHODS OF USE THEREOF

#108
20180363455
2018-12-20

Rotating control device with communications module

#109
20180363405
2018-12-20

ROTATING CONTROL DEVICE

#110
20180363404
2018-12-20

Rotating control device

#111
20180363403
2018-12-20

PUMP DRIVE HEAD WITH STUFFING BOX

#112
20180355683
2018-12-13

Packer box and method for installation or withdrawal of a packer element in, respectively from a packer box for use in petroleum drilling

#113
20180340386
2018-11-29

Running tool for use with bearing assembly

#114
20180340383
2018-11-29

Sealing and controlling of fluid pressure in an annular fluid passageway in a wellbore related process

#115
20180334877
2018-11-22

Pressure containment device

#116
20180334876
2018-11-22

Annular blowout preventer packer assembly

#117
20180334862
2018-11-22

Pressure control device for use with a subterranean well

#118
20180328134
2018-11-15

Topside standalone lubricator for below-tension-ring rotating control device

#119
20180320466
2018-11-08

MPD-capable flow spools

#120
20180320453
2018-11-08

Integral DSIT and flow spool

#121
20180274362
2018-09-27

Communication system for an offshore drilling system

#122
20180274323
2018-09-27

Intelligent pressure control devices and methods of use thereof

#123
20180258730
2018-09-13

Integrated rotating control device and gas handling system for a marine drilling system

#124
20180245444
2018-08-30

Intelligent RCD system

#125
20180245416
2018-08-30

Large-width diameter riser segment lowerable through a rotary of a drilling rig

#126
20180187495
2018-07-05

Method of using a rotating and reciprocating swivel apparatus

#127
20180187494
2018-07-05

Downhole swivel apparatus and method

#128
20180179827
2018-06-28

Riser system for coupling selectable modules to the riser

#129
20180155993
2018-06-07

Rotating control device, and installation and retrieval thereof

#130
20180135379
2018-05-17

Annular packer system and method

#131
20180135377
2018-05-17

Drilling stripping element

#132
20180135366
2018-05-17

Heave compensated managed pressure drilling

#133
20180135362
2018-05-17

Combined casing and drill-pipe fill-up, flow-back and circulation tool

#134
20180094499
2018-04-05

Elastomeric seal for rotating heads

#135
20180087571
2018-03-29

Bearing pressure indicator having a proximity switch arrangement

#136
20180058169
2018-03-01

Pressure control device, and installation and retrieval of components thereof

#137
20180038177
2018-02-08

Modified pumped riser solution

#138
20170370181
2017-12-28

Shaft blowout prevention device

#139
20170362929
2017-12-21

Methods for assessing the reliability of hydraulically-actuated devices and related systems

#140
20170335683
2017-11-23

MUD TELEMETRY WITH ROTATING CONTROL DEVICE

#141
20170328145
2017-11-16

Rotating control device, and installation and retrieval thereof

#142
20170247972
2017-08-31

Rotating control device

#143
20170226846
2017-08-10

Latch position indicator system and method

#144
20170226809
2017-08-10

Frictional support of seal bore protector

#145
20170218716
2017-08-03

Systems and methods for assembling a blowout preventer

#146
20170191333
2017-07-06

Rotating control device

#147
20170167221
2017-06-15

Rotating control device having a partition seal assembly

#148
20170159395
2017-06-08

Pressurizing rotating control devices

#149
20170159393
2017-06-08

Pipe ram assembly for many actuation cycles

#150
20170159383
2017-06-08

Devices for continuous mud-circulation drilling systems

#151
20170159381
2017-06-08

Proximity detection between tubulars for blind stabbing

#152
20170145770
2017-05-25

Spherical blow out preventer annular seal

#153
20170145764
2017-05-25

Managed pressure drilling system having well control mode

#154
20170130549
2017-05-11

Blowout preventer including shear body

#155
20170130542
2017-05-11

Pressure Control System and Optional Whipstock Repositioning System for Short Radius Lateral Drilling

#156
20170114606
2017-04-27

Radial seal pressure reduction using internal pump

#157
20170114602
2017-04-27

Mechanically coupling a bearing assembly to a rotating control device

#158
20170101837
2017-04-13

Riser with internal rotating flow control device

#159
20170074057
2017-03-16

Offshore drilling system, vessel and methods

#160
20170067295
2017-03-09

RISER GAS HANDLING SYSTEM

#161
20170058632
2017-03-02

RISERLESS WELL SYSTEMS AND METHODS

#162
20170051785
2017-02-23

Rotating pressure control head system and method of use

#163
20170044857
2017-02-16

METHOD OF OPERATING A DRILLING SYSTEM

#164
20170016303
2017-01-19

Pressure staging for wellhead stack assembly

#165
20170009550
2017-01-12

Sealing element wear indicator system

#166
20160369576
2016-12-22

Downhole swivel apparatus and method

#167
20160348460
2016-12-01

Apparatus and method for data transmission from a rotating control device

#168
20160348449
2016-12-01

Connector assembly for connecting a hose to a tubular

#169
20160334018
2016-11-17

Modular sealing elements for a bearing assembly

#170
20160312565
2016-10-27

Autonomous blowout preventer

#171
20160305213
2016-10-20

Drill tool insert removal

#172
20160298411
2016-10-13

Assembly and arrangement for a drilling column composed of smooth rods for a system to prevent ingress in the stage of drilling oil/gas wells

#173
20160290088
2016-10-06

Cooling of rotating control device

#174
20160273333
2016-09-22

Sealing element wear detection for wellbore devices

#175
20160273297
2016-09-22

Annular sealing for use with a well

#176
20160258239
2016-09-08

Rotating Control Device with Latch Biased Toward Engagement

#177
20160245037
2016-08-25

OILFIELD DEVICE WITH WIRELESS TELEMETRY

#178
20160245028
2016-08-25

Running and pulling tool for use with rotating control device

#179
20160230492
2016-08-11

Riser gas handling system

#180
20160230491
2016-08-11

Fluid supply to sealed tubulars

#181
20160230486
2016-08-11

Latching assembly

#182
20160222751
2016-08-04

Self-Lubricating Seal Element for Rotating Control Device

#183
20160201418
2016-07-14

Polish rod locking clamp

#184
20160194929
2016-07-07

Reinforced drill pipe seal with floating backup layer

#185
20160186510
2016-06-30

Tubular stabbing guide

#186
20160177650
2016-06-23

Elastomeric seal for rotating heads

#187
20160138352
2016-05-19

Annular isolation device for managed pressure drilling

#188
20160123399
2016-05-05

Rotating control device with rotary latch

#189
20160076323
2016-03-17

MPD-capable flow spools

#190
20160076312
2016-03-17

Large-width/diameter riser segment lowerable through a rotary of a drilling rig

#191
20160047187
2016-02-18

Wellbore drilling using dual drill string

#192
20160040483
2016-02-11

Method of using a rotating and reciprocating swivel

#193
20160024871
2016-01-28

Remote operation of a rotating control device bearing clamp and safety latch

#194
20150376970
2015-12-31

Annular drilling device

#195
20150369000
2015-12-24

Sealing assembly

#196
20150345237
2015-12-03

Rotating control device radial seal protection

#197
20150345236
2015-12-03

Misalignment mitigation in a rotating control device

#198
20150337599
2015-11-26

Monitoring a condition of a component in a rotating control device of a drilling system using embedded sensors

#199
20150330205
2015-11-19

Marine diverter system with real time kick or loss detection

#200
20150315847
2015-11-05

Apparatus and method for data transmission from a rotating control device

#201
20150315845
2015-11-05

Sealing element mounting

#202
20150300110
2015-10-22

System and method for managing pressure when drilling

#203
20150285013
2015-10-08

Aligning borehole drilling equipment

#204
20150275602
2015-10-01

Apparatus and method for controlling pressure in a borehole

#205
20150226025
2015-08-13

Positive retraction latch locking dog for a rotating control device

#206
20150226024
2015-08-13

Latching assembly

#207
20150218898
2015-08-06

Downhole swivel apparatus and method

#208
20150204146
2015-07-23

Rotating control device having jumper for riser auxiliary line

#209
20150184484
2015-07-02

Polish rod locking clamp

#210
20150159460
2015-06-11

Rotating flow control diverter having dual stripper elements

#211
20150144400
2015-05-28

Pressure containment device

#212
20150136407
2015-05-21

Rotating control device docking station

#213
20150108377
2015-04-23

Internal blow out preventer

#214
20150034326
2015-02-05

System and method for managing heave pressure from a floating rig

#215
20150027688
2015-01-29

Low profile rotating control device

#216
20150021045
2015-01-22

Rotating flow control device for wellbore fluid control device

#217
20140367114
2014-12-18

Latch position indicator system and method

#218
20140262313
2014-09-18

Riser gas handling system

#219
20140262205
2014-09-18

Annular blowout container (ABOC)

#220
20140216751
2014-08-07

Integrated managed pressure drilling riser joint

#221
20140216721
2014-08-07

Rotating flow head apparatus

#222
20140178155
2014-06-26

Riser auxiliary line jumper system for rotating control device

#223
20140175749
2014-06-26

Device for producing a bore in the ground, rotary drive device and rotary seal arrangement

#224
20140166273
2014-06-19

Rotating control device docking station

#225
20140138094
2014-05-22

System and method for cooling a rotating control device

#226
20140048731
2014-02-20

Blow out preventer

#227
20140014353
2014-01-16

Packer setting and/or unsetting

#228
20130341052
2013-12-26

Seal element guide

#229
20130292139
2013-11-07

Cable bypass and method for controlled entry of a tubing string and a cable adjacent thereto

#230
20130284454
2013-10-31

Rubber element removal tool

#231
20130233556
2013-09-12

ROTATING FLOW CONTROL DIVERTER

#232
20130192896
2013-08-01

Method for cooling a rotating control device

#233
20130192847
2013-08-01

Seal assemblies in subsea rotating control devices

#234
20130168578
2013-07-04

Blowout preventer assembly

#235
20130140034
2013-06-06

Seabed well influx control system

#236
20130126182
2013-05-23

Riserless, pollutionless drilling system

#237
20130118806
2013-05-16

System and method for managing heave pressure from a floating rig

#238
20130112404
2013-05-09

Preemptive setpoint pressure offset for flow diversion in drilling operations

#239
20130105169
2013-05-02

Rotating and reciprocating swivel apparatus and method

#240
20130062122
2013-03-14

High temperature drilling with lower temperature rated tools

#241
20130032360
2013-02-07

Alignment of BOP stack to facilitate use of a rotating control device

#242
20130032359
2013-02-07

Rotating head

#243
20130020068
2013-01-24

ROTATING FLOW CONTROL DEVICES HAVING STABILIZED BEARINGS

#244
20130014991
2013-01-17

Drilling system and method of operating a drilling system

#245
20130009366
2013-01-10

Low profile rotating control device

#246
20120318496
2012-12-20

Subsea internal riser rotating control head seal assembly

#247
20120305102
2012-12-06

Internal blow out preventer

#248
20120261888
2012-10-18

ELASTOMERIC SEAL FOR ROTATING HEADS

#249
20120255783
2012-10-11

Rotating control device with positive drive gripping device

#250
20120247754
2012-10-04

STUFFING BOX ASSEMBLY

#251
20120217022
2012-08-30

Universal rotating flow head having a modular lubricated bearing pack

#252
20120177313
2012-07-12

Seal cleaning and lubricating bearing assembly for a rotating flow diverter

#253
20120138366
2012-06-07

Method for cooling a rotating control head

#254
20120125633
2012-05-24

Remote operation of a rotating control device bearing clamp and safety latch

#255
20120125598
2012-05-24

Remote operation of a rotating control device bearing clamp

#256
20120118559
2012-05-17

RCD sealing elements with multiple elastomer materials

#257
20120103630
2012-05-03

Alignment of BOP stack to facilitate use of a rotating control device

#258
20120085545
2012-04-12

Apparatus and method for controlled pressure drilling

#259
20120073113
2012-03-29

Adaptor flange for rotary control device

#260
20120055677
2012-03-08

ROTATING FLOW CONTROL DIVERTER WITH RISER PIPE ADAPTER

#261
20120043726
2012-02-23

Multiple sealing element assembly

#262
20120013133
2012-01-19

Positive retraction latch locking dog for a rotating control device

#263
20120000664
2012-01-05

Acoustically controlled subsea latching and sealing system and method for an oilfield device

#264
20110315404
2011-12-29

Lubricating seal for use with a tubular

#265
20110278014
2011-11-17

External jet pump for dual gradient drilling

#266
20110266005
2011-11-03

CONTINUOUS ROD PUMP DRIVE SYSTEM

#267
20110253445
2011-10-20

System and method for managing heave pressure from a floating rig

#268
20110214871
2011-09-08

Flushing procedure for rotating control device

#269
20110203802
2011-08-25

Pressure control device with remote orientation relative to a rig

#270
20110174503
2011-07-21

Method and apparatus for installing a wireline for logging or other operations in an under-balanced well

#271
20110174501
2011-07-21

Cable bypass and method for controlled entry of a tubing string and a cable adjacent thereto

#272
20110168405
2011-07-14

Alignment of BOP stack to facilitate use of a rotating control device

#273
20110168392
2011-07-14

Remote operation of an oilfield device

#274
20110168382
2011-07-14

Leak detection method for a rotating control head bearing assembly and its latch assembly using a comparator

#275
20110140365
2011-06-16

Rotary seal with supported inlet

#276
20110108282
2011-05-12

Apparatus and method for managed pressure drilling

#277
20110056681
2011-03-10

Method and apparatus for performing wireline logging operations in an under-balanced well

#278
20110036638
2011-02-17

Interlocking low profile rotating control device

#279
20110036629
2011-02-17

Rotating control head leak detection systems

#280
20110024195
2011-02-03

Drilling with a high pressure rotating control device

#281
20100307772
2010-12-09

Solid rubber packer for a rotating control device

#282
20100269570
2010-10-28

Dual stripper rubber cartridge with leak detection

#283
20100252329
2010-10-07

Bearing assembly inner barrel and well drilling equipment comprising same

#284
20100252328
2010-10-07

Tapered surface bearing assembly and well drilling equipment comprising same

#285
20100243233
2010-09-30

Oilfield stuffing box

#286
20100218938
2010-09-02

Heat exchanger system and method of use thereof and well drilling equipment comprising same

#287
20100213635
2010-08-26

Reinforced stripper rubber body and method of making same

#288
20100200213
2010-08-12

Force balanced rotating pressure control device

#289
20100187015
2010-07-29

Bearing assembly system with integral lubricant distribution and well drilling equipment comprising same

#290
20100186946
2010-07-29

Bearing assembly retaining apparatus and well drilling equipment comprising same

#291
20100175882
2010-07-15

Subsea internal riser rotating control device system and method

#292
20100089655
2010-04-15

Rotating control device with replaceable bowl sleeve

#293
20100089654
2010-04-15

Rotating control device having bearing assembly housing with replaceable wear sleeve

#294
20100069167
2010-03-18

Kelly driver

#295
20100025117
2010-02-04

Spring load seal assembly and well drilling equipment comprising same

#296
20100012317
2010-01-21

RCD HYDRAULIC STRIPPING ADAPTER

#297
20100008190
2010-01-14

Apparatus and method for data transmission from a rotating control device

#298
20090314544
2009-12-24

Well drilling and production using a surface blowout preventer

#299
20090272521
2009-11-05

Stuffing Box for Pump Drive Head of Oil Well

#300
20090260887
2009-10-22

Spring preloaded bearing assembly and well drilling equipment comprising same