Assignee

VALLOUREC

FR38 patents

Top patents by PatentIndex Score

US4413395ANov 8, 1983

Method for fixing a tube by expansion

VALLOUREC180 citations98

US4641513AFeb 10, 1987

Cold rolling process for tubes, by means of a Pilger rolling mill and the rolling mill for its execution

VALLOUREC29 citations92

US4426105AJan 17, 1984

Joints for pipes, particularly intended for the oil industry

VALLOUREC116 citations92

US4796668AJan 10, 1989

Device for protecting threadings and butt-type joint bearing surfaces of metallic tubes

VALLOUREC227 citations90

US4373750AFeb 15, 1983

Joint for pipe intended for petroleum industry

VALLOUREC87 citations90

US4828294AMay 9, 1989

Threaded joint for steel pipes containing a sealing device located at the level of the threading

VALLOUREC24 citations89

US4828295AMay 9, 1989

Steel tube threaded joint having an impervious device at the level of the threading

VALLOUREC35 citations89

US4614120ASep 30, 1986

Determination of the make-up torque for pipe joints

VALLOUREC43 citations89

US4787680ANov 29, 1988

Semi-rigid axle for a vehicle

VALLOUREC45 citations85

US4658617AApr 21, 1987

Method permitting the increase of operations of cold pilger mills and an apparatus for the embodiment of this method

VALLOUREC16 citations81

US4729422AMar 8, 1988

Process and apparatus for the production of hollow bodies by continuously casting in a magnetic field

VALLOUREC21 citations79

US4665780AMay 19, 1987

Device for determining when a threaded tube joint with screw limiting stop is properly made up

VALLOUREC16 citations77

US4700576AOct 20, 1987

Process and device for executing the screwing of a threaded joint for tubes, equipped with a stop

VALLOUREC24 citations77

US4019394AApr 26, 1977

Drive device for clamp holder carriages of a continuously operating pilger mill

VALLOUREC7 citations73

US4380480AApr 19, 1983

Method of making one-piece tubular axle blanks and the produced axle blanks

VALLOUREC26 citations72

US4708897ANov 24, 1987

Composite product having a tubular metal casing with a welt-type seam, and a core in powder form, which can be rolled up

VALLOUREC18 citations71

US4816068AMar 28, 1989

Composite article having a tubular sheath containing a compacted material, for the treatment of liquid metals, and process for the production of said article

VALLOUREC6 citations70

US4617067AOct 14, 1986

Process for the production of semi-finished articles of hard steels using a continuous casting operation

VALLOUREC10 citations70

US4486227ADec 4, 1984

Manufacture of a composite tubular product

VALLOUREC14 citations69

US4375160AMar 1, 1983

Manufacture of seamless steel tube

VALLOUREC17 citations65

US4641410AFeb 10, 1987

Method and apparatus for making a joint for steel tubes

VALLOUREC10 citations64

US4713955ADec 22, 1987

Method permitting the increase of operations of cold pilger mills and an apparatus for the embodiment of this method

VALLOUREC4 citations62

US4974660ADec 4, 1990

Process and apparatus for the production of hollow bodies by continuously casting in a magnetic field

VALLOUREC3 citations60

US4515020AMay 7, 1985

Method and apparatus for ensuring correct thread make-up of a pipejoint

VALLOUREC3 citations60

US4906292AMar 6, 1990

Composite article having a tubular sheath containing a compacted material, for the treatment of liquid metals, and process for the production of said article

VALLOUREC4 citations59

US4665734AMay 19, 1987

Method and installation for selective detection of defects in a workpiece

VALLOUREC13 citations59

US4383604AMay 17, 1983

Device for the transfer of long products particularly bars or tubes

VALLOUREC15 citations59

US4326398AApr 27, 1982

Apparatus to equalize in height, by hammering, the line of welding of longitudinally welded tubes

VALLOUREC13 citations59

US4531972AJul 30, 1985

Method for the fabrication of steels with high machinability

VALLOUREC6 citations58

US4483638ANov 20, 1984

Device for fixing a piercing or expanding plug to a piercing or expanding bar

VALLOUREC7 citations58

US4353238AOct 12, 1982

Method for manufacture of seamless metal tubing by continuous rolling

VALLOUREC7 citations58

US4395897AAug 2, 1983

Rolling head support assembly for a rolling mill

VALLOUREC5 citations54

US4555265ANov 26, 1985

Method of treating steel with calcium, to obtain a steel well adapted to cold forming, with a low silicon content

VALLOUREC1 citations47

US4691791ASep 8, 1987

Knurled drill stem

VALLOUREC5 citations46

US4373703AFeb 15, 1983

Device for rapidly cooling metal tubes

VALLOUREC3 citations45

VALLOUREC

Top patents by PatentIndex Score

Method for fixing a tube by expansion

Cold rolling process for tubes, by means of a Pilger rolling mill and the rolling mill for its execution

Joints for pipes, particularly intended for the oil industry

Device for protecting threadings and butt-type joint bearing surfaces of metallic tubes

Joint for pipe intended for petroleum industry

Threaded joint for steel pipes containing a sealing device located at the level of the threading

Steel tube threaded joint having an impervious device at the level of the threading

Determination of the make-up torque for pipe joints

Semi-rigid axle for a vehicle

Method permitting the increase of operations of cold pilger mills and an apparatus for the embodiment of this method

Process and apparatus for the production of hollow bodies by continuously casting in a magnetic field

Method of machining threaded pipe-ends

Magnetic rotor for the continuous casting of hollow bodies

Manufacture of a composite tubular product

Device for determining when a threaded tube joint with screw limiting stop is properly made up

Process and device for executing the screwing of a threaded joint for tubes, equipped with a stop

Drive device for clamp holder carriages of a continuously operating pilger mill

Method of making one-piece tubular axle blanks and the produced axle blanks

Composite product having a tubular metal casing with a welt-type seam, and a core in powder form, which can be rolled up

Composite article having a tubular sheath containing a compacted material, for the treatment of liquid metals, and process for the production of said article

Process for the production of semi-finished articles of hard steels using a continuous casting operation

Manufacture of a composite tubular product

Manufacture of seamless steel tube

Method and apparatus for making a joint for steel tubes

Method permitting the increase of operations of cold pilger mills and an apparatus for the embodiment of this method

Process and apparatus for the production of hollow bodies by continuously casting in a magnetic field

Method and apparatus for ensuring correct thread make-up of a pipejoint

Composite article having a tubular sheath containing a compacted material, for the treatment of liquid metals, and process for the production of said article

Method and installation for selective detection of defects in a workpiece

Device for the transfer of long products particularly bars or tubes

Apparatus to equalize in height, by hammering, the line of welding of longitudinally welded tubes

Method for the fabrication of steels with high machinability

Device for fixing a piercing or expanding plug to a piercing or expanding bar

Method for manufacture of seamless metal tubing by continuous rolling

Rolling head support assembly for a rolling mill

Method of treating steel with calcium, to obtain a steel well adapted to cold forming, with a low silicon content

Knurled drill stem

Device for rapidly cooling metal tubes