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| Number | Title | Issue Date |
| 8146225 | Method of forming a clamping ring and a clamping ring For forming a clamping ring first the pipe is extruded. The extruded pipe is cut to form a pipe part. While extruding the pipe, its inner diameter is formed smaller than the outer diameter of a pipe onto which the clamping ring is positioned before making a pipe con... | 04/03/2012 |
| 8141913 | Press fitting for a pipe The press fitting for a pipe is provided with a fitting element which comprises a supporting element onto which a pipe to be connected can be pushed. Furthermore, the press fitting comprises a compression sleeve which has on its circumferential surface a compression... | 03/27/2012 |
| 7644958 | Compression fitting for a heating and/or sanitary pipe The compression fitting (10) for a heating and/or sanitary pipe comprises a fitting body (12) including a supporting sleeve (16) adapted to have a pipe end (66) slid thereonto, and a conical abutment face (20). The compression fitt... | 01/12/2010 |
| 7631668 | Piping element and manufacturing method and apparatus A piping element having at least two longitudinal components, such as flow pipes (4), outside of which there is an insulator (3), outside of which there is a corrugated outer sheath (2). The piping element is bendable. Fastening means are arrang... | 12/15/2009 |
| 7469935 | Pipe fitting comprising at least two layers of different material, the innermost layer made of plastic A pipe fitting for connecting at least two pipes, the pipe fitting (1) comprising at least two layers. An innermost layer (2) and an outer layer (3) are of different materials. The innermost layer (2), which gets into contact the liquid t... | 12/30/2008 |
| 7077164 | Pipe A pipe has an innermost layer, outside of which there is an inner electrode layer, outside of which there is an insulating layer, outside of which there is an outer electrode layer. The innermost layer is made of plastic by continuous extrusion and the insulating la... | 07/18/2006 |
| 7007716 | Branchtubing for pipework The invention relates to a branch piece for a pipework, comprising a body (1) including at least one branch fitting (2). A connecting piece (3) is arrangeable in the branch fitting (2). The branch piece includes a locking means made up of... | 03/07/2006 |
| 6959736 | Multilayer pipe and method for manufacturing one A multilayer pipe which comprises at least an inner layer and an outer layer. The inner layer is made of extrudable plastic, such as polyethylene PE, cross-linked polyethylene PEX or polypropylene PP. The outer layer forms a fire-protecting layer and the matrix plas... | 11/01/2005 |
| 6861026 | Method of making a pipe having a socket A method and an apparatus for making a pipe, and a pipe, wherein the pipe is made from a plastic feedstock pipe by expanding it against a mould. In the first step, that portion of the plastic feedstock pipe (4) which is to have a greater diameter than the res... | 03/01/2005 |
| 6822205 | Method for producing multilayer metal composite tubes A process for the production of multi-layer metal composite tubes (10), wherein a metal strip is shaped to form a tube (16) and butt-welded along its two longitudinal edges. A plastic inner layer (12) is applied by extrusion in firmly adhering m... | 11/23/2004 |
| 6689472 | Apparatus for extrusion of polymers and plastic products formed with the apparatus An apparatus for manufacturing an extruded plastic product, the apparatus including at least one rotor and at least one stator defining a clearance having a feed gap between them, the rotor and stator collectively including a groove for moving material to... | 02/10/2004 |
| 6672324 | Method of manufacturing branched pipe, pipe manufacturing apparatus and branched pipe A branched pipe (5) is manufactured by continuous extrusion in such a manner that a manifold (5a) of a branched pipe (5) is manufactured by extruding plastic material into the space defined by moving chill moulds (1, 2) and a mandrel (10) arranged therein... | 01/06/2004 |
| 6638589 | Method and apparatus for using recycled plastic material, and a plastic product made by an extruder The invention relates to a method and apparatus for using recycled plastic material, and to a plastic product produced by an extruder. In the invention, crosslinked polyethylene is ground to powder form and mixed with e.g. polyethylene so that the proport... | 10/28/2003 |
| 6550500 | Plastic pipe having a socket, and a method of providing a plastic pipe with a socket A plastic pipe provided with a socket and a method of providing a plastic pipe with a socket, whereby the socket comprises at least two layers. The orientation of at least one socket layer is different from the orientation of another layer and the orienta... | 04/22/2003 |
| 6551534 | Method and arrangement for cooling an extruded hollow product The invention relates to a method and an arrangement for cooling an extruded hollow product. According to the invention, the extruder (1) is provided with means for sucking air through the pipe (2). The air to be sucked is thus in contact with the inner s... | 04/22/2003 |
| 6446674 | Method of producing homogeneous material with an extruder, an extruder, and a multilayer plastic pipe An extruded multilayer plastic pipe is provided. The pipe comprises an inner layer, an outer layer and an intermediate layer. Each of the inner and outer layers is comprised of a thermoplastic material. The intermediate layer consists essentially of a low... | 09/10/2002 |
| 6372168 | Method of manufacturing branched pipe A branched pipe (5) is manufactured by continuous extrusion in such a manner that a manifold (5a) of a branched pipe (5) is manufactured by extruding plastic material into the space defined by moving chill molds (1, 2) and a mandrel (10) arranged therein ... | 04/16/2002 |
| 6309574 | Extrusion of high molecular weight polymers A method for manufacturing an extrudable product including the steps of (a) providing an apparatus including an extruder having at least one rotor with first grooves, at least one stator with second grooves and a clearance between the rotor and the stator... | 10/30/2001 |
| 6296804 | Biaxial stretching of plastic tubes A continuous process and apparatus for producing oriented plastic tube comprising the steps of extrusion, temperature conditioning, diametrical expansion and cooling, characterized by the step of inducing axial draw of the tube between first and second ha... | 10/02/2001 |
| 6258197 | Method for manufacturing pipe fitting, and pipe fitting The invention relates to a method for manufacturing a pipe fitting, said method comprising manufacturing a preform (1) of plastic, and forming an additional layer (3) on top of it. According to the invention, the additional layer (3) is formed by winding ... | 07/10/2001 |
| 6237963 | Service riser A service riser 10 comprises a steel jacket 11 around a polyethylene pipe 12 which terminates in the riser at a transition zone 20. The transition zone 20 comprises a retainer sleeve 30 inserted in the end of the pipe 12 and sealed thereto by an O-ring 38... | 05/29/2001 |
| 6210617 | Apparatus and method for adjusting a mandrel and kernel while producing a plastic pipe The present invention relates to an apparatus for producing pipes of a moldable material, preferably plastic, comprising an extruder, a cylindrical mold comprising chill molds (4, 5), a mandrel (8) inside the extruder and a kernel (9) as an extension of t... | 04/03/2001 |
| 6203651 | Method and apparatus for making an extrusion product, and an extrusion product An extrusion material is extruded through a tool and a fluoropolymer is between the extrusion material and a surface of the tool for reducing friction between the extrusion material and the surface of the tool. The surface of the tool is of a material wit... | 03/20/2001 |
| 6149756 | Method for joining plastic pipes, a joint ring used in the joining and a pipe joint provided with the method A method for joining a first tubular member to a second tubular member. The method provides a stretchable and compressible welding ring having a flexible inner ring, a resistance coil wound around the inner ring and at least one layer of plastic coating t... | 11/21/2000 |
| 6089615 | Branch pipe connection The present invention relates to a branch pipe connection including a locking ring and a sleeve that are arranged against one another and can be tightened in their axial direction. The connection further includes a support flange. The locking ring is of s... | 07/18/2000 |
| 6086116 | Pipe joint for joining pipes with a bent pipe or branch The invention relates to a pipe joint for joining pipes with a bent pipe or branch (1) comprising a body (2) having an inner diameter less than the exterior diameter of the pipe (4) to be joined, and sleeve portions (3a, 3b) having an inner diameter subst... | 07/11/2000 |
| 6073657 | Method for producing homogeneous material with an extruder, an extruder, and a multilayer plastic pipe A method for producing a homogeneous material with an extruder is provided. The extruder has at least two annular conical feed gaps situated between a rotatable rotor and a stator so that the material to be extruded is supplied between the rotor and the s... | 06/13/2000 |
| 5957505 | Branch pipe connection The present invention relates to a branch pipe connection for connecting a branch pipe to a lightly constructed underground sewage and drainage pipe. The connection includes a locking ring and a sleeve that are arranged against one another and can be tigh... | 09/28/1999 |
| 5759461 | Method of forming a multi-layer plastic pipe for conducting fluids A method of forming a two-layer plastic pipe (4;8) to be laid in the ground for conducting material therethrough forms a core pipe (2) consisting essentially of a first plastic material and forms a detachable outer hose (3;7) of a second plastic material ... | 06/02/1998 |
| 5752786 | Method for relining a branch conduit of a main conduit The invention relates to a method for relining an underground branch conduit (10) of an underground main conduit (11) by a relining pipe (14) in the form of a radially stiff double-walled pipe with a corrugated outer wall (14A) and a smooth elastic inner ... | 05/19/1998 |
| 5601776 | Method and a mould for forming an expansion, such as a socket, in a pipe, and a plastic pipe The present invention relates to a method and a mould for forming an expansion, such as a socket, in a plastic pipe, and a plastic pipe. According to the method, the heated end of the pipe is placed in an external mould (2) and pressed against the mould s... | 02/11/1997 |
| 5589127 | Method and apparatus for forming ribs with sideward projections in a plastic pipe, and a plastic pipe The invention relates to a method and an apparatus for forming ribs with sideward projections in a plastic pipe. The projections are formed by means of elongated rolls (10) each moving around the pipe and rotating about its central axis, the rolls being i... | 12/31/1996 |
| 5469891 | Method for relining underground pipelines The invention relates to a material wherein the main constituent is PVC for manufacturing pipes to be used for relining underground pipelines by the pipe in a folded condition being drawn into the pipeline and being engaged with the inside surface of the ... | 11/28/1995 |
