| Patents for B28B 21 - Methods or machines specially adapted for the production of tubular articles (3,281) |
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| 12/06/2000 | CN2409036Y Fast press for producing infiltrating irrigation water pipe of flyash cement |
| 11/30/2000 | WO2000071317A1 Process for the production of hollow tubular parts, parts and assembly obtained from them |
| 11/29/2000 | EP1055495A2 Method for forming conveying rollers for ceramic kilns, apparatus for implementing the method and roller obtained with the apparatus |
| 11/22/2000 | EP1054204A2 Pipe, especially of concrete, comprising a seal and a process for the manufacture of such a pipe |
| 11/22/2000 | CN1058652C Appts. for mfg. long pipe by centrifugal casting process |
| 11/09/2000 | WO2000066337A1 Installation for producing pipes by centrifugal casting |
| 11/08/2000 | CN2404669Y Aluminothermy method for producing ceramic composite steel pipe |
| 11/08/2000 | CN1272827A Paper feed roller |
| 11/02/2000 | DE19918972A1 Core segment for molding concrete ring-shaped components has an opening with a closure piece to work with the clamp and seal the opening with the inserted climbing hoop |
| 10/11/2000 | CN2400248Y Concrete tube producing machine |
| 09/13/2000 | CN2395868Y Steel concrete vertical mandrel internal vibration semiconductor pipe (device) |
| 08/30/2000 | CN1055889C Method of producing patterned shaped article |
| 08/22/2000 | US6106749 Method and machine for making concrete pipe |
| 08/09/2000 | CN1262788A Shaped body consisting of textured superconductor material and method for producing same |
| 08/09/2000 | CN1262164A Compounding technology without locating die for compound cast stone pipe |
| 08/02/2000 | CN1055044C Continuous plastering process for mortar lining of small-bore pipe |
| 07/12/2000 | EP1018478A1 Paper feed roller |
| 07/12/2000 | CN1259423A Mfg. method of large diameter steel tyre steel reinforced concrete composite pipeline |
| 06/28/2000 | EP1011942A1 Method and apparatus for producing bar-shaped hollow members made of concrete |
| 06/21/2000 | DE19855572A1 Concrete pipe and internal liner manufacturing process, involving power-controlled expansion of inner shell until internal liner exerts characteristic counter-force |
| 06/14/2000 | EP1008795A1 A sealing device |
| 06/14/2000 | EP0686245B1 A sealing device, a mould element and a pipe |
| 05/31/2000 | CN2380369Y Steel-fiber cement filtering water-drainage pipe |
| 05/10/2000 | CN1052327C Process for producing tubular moldings from high temperature superconducting material |
| 05/03/2000 | CN1251798A Reinforced concrete pipe with cross-section variable ends and its prefabricating technology |
| 04/19/2000 | CN2374322Y Internally viberating extruding continuously depositing concrete tuber |
| 04/12/2000 | CN2373236Y Reinforced concrete deep motor-pumped well pipe |
| 04/05/2000 | EP0990497A2 A machine for vertical casting of pipes of concrete or a similar material in a mould system with a distributor wheel |
| 03/29/2000 | CN2371012Y Hydraulic pushing type ceramic pipe blank shaper |
| 03/22/2000 | EP0986828A1 Shaped body consisting of textured supraconductor material and method for producing the same |
| 01/26/2000 | CN1242280A Slip casting technology for preparing electrolyte thin wall tube, and method for making plaster mother mould |
| 01/25/2000 | US6017208 Chain driven roller system for use in concrete pipe manufacturing |
| 01/19/2000 | CN2359082Y Machine for forming concrete construction member |
| 12/29/1999 | WO1999067163A1 Paper feed roller |
| 12/28/1999 | US6008163 Process for slip casting textured tubular structures |
| 12/23/1999 | DE19929114A1 Mandrel to form a branch connection in a cast concrete pipe section |
| 12/22/1999 | CN2354725Y Vertical uncontinuous dual glass pipe bottle making mechanism |
| 12/21/1999 | US6004126 Apparatus for manufacturing bell and spigot pipe moldings |
| 12/15/1999 | EP0964088A2 Fabric for forming fibre cement articles |
| 12/12/1999 | CA2273746A1 Fabric for forming fiber cement articles |
| 12/08/1999 | CN1237672A Air channel and its making and forming method |
| 12/08/1999 | CN1047123C Manufacturing method of composite pipe with ceramic lining |
| 11/23/1999 | US5988224 Modular sleeve for protecting, repairing or renovating a pipe |
| 11/18/1999 | DE19816618A1 Vibrator with vibrator units, housing and rotor |
| 10/26/1999 | US5972274 Making of ceramic tube |
| 10/07/1999 | WO1999050036A1 Mould for moulding tubes, method and apparatus for producing the mould |
| 10/05/1999 | US5961916 Method of manufacturing a passage tube for passing plasma producing gas |
| 09/29/1999 | CN1045280C Hydraulic hard compsn. and process for producing concrete pile using the same |
| 09/08/1999 | CN1044988C Producing process and equipment for high-pure ceramic membranous canal |
| 08/31/1999 | US5945384 Process for producing tubular moldings from high-temperature superconducting material |
| 08/19/1999 | DE19805067A1 Concrete component manufacture for pipes, shaft rings, shaft necks, etc. |
| 08/18/1999 | EP0936041A2 Process for making concrete articles |
| 08/18/1999 | EP0856117B1 Modular sleeve for protecting, repairing or renovating a pipe |
| 08/10/1999 | US5937316 SiC member and a method of fabricating the same |
| 07/28/1999 | CN2330487Y Mould structure capable of producing embossed continuous taper tube |
| 07/15/1999 | DE19800508A1 Concrete pipe with basket-form steel reinforcement, for water drainage systems |
| 06/29/1999 | CA2124863C Slip casting process and apparatus for producing graded materials |
| 06/23/1999 | CN2325190Y Machine for producing concrete tubular article |
| 06/16/1999 | CN2323941Y Centrifugal equipment for producing ceramic lining composite steel pipe |
| 06/08/1999 | US5910325 System for moulding tubular goods |
| 05/19/1999 | CN2319195Y Corrosion-proof treatment device for inner wall of steel pipe |
| 05/12/1999 | CN2318019Y Vibrative pipe making machine for spigot and faucet mouth cement pipe core mould |
| 05/12/1999 | CN2318018Y Suspending roll machine |
| 05/06/1999 | EP0913238A1 Method for producing a polyurethane pipe inside a concrete pipe, and composite product thus obtained |
| 05/05/1999 | CN2317065Y Fast demould cement tube steel mould |
| 04/21/1999 | CN2314916Y 气动式振动器 Pneumatic vibrator |
| 04/21/1999 | CN2314915Y Secondary purifying slurry prestress steel tube concrete pipe |
| 04/06/1999 | US5891516 Forming fiber cement articles employed in building materials, i.e. siding, roofing, pipes |
| 03/31/1999 | CN2312121Y Drawer type mould for casting super thin concrete ventilation way |
| 03/25/1999 | WO1999014025A1 Method and apparatus for producing bar-shaped hollow members made of concrete |
| 03/25/1999 | DE19741954A1 Verfahren und Vorrichtung zur Herstellung von Betonformteilen Method and device for producing concrete moldings |
| 03/24/1999 | EP0903209A1 Process and device for making concrete products |
| 03/24/1999 | CN1211495A Antiseepage, compression-resistant and thermal insulating sand-free concrete centrifugal block and its centrifugal formation method |
| 03/18/1999 | DE19740154A1 Hollow rod-form concrete item manufacturing process |
| 03/10/1999 | CN1210058A Manufacture of corrosionproof pipes |
| 02/17/1999 | CN1042159C Technology method for external square, internal circular hollow prestress steel rod concrete prefabricated pile |
| 02/03/1999 | EP0894592A1 Holder for positioning a reinnforcement in a mould during the automated manufacture of thin reinforced concrete articles |
| 02/03/1999 | CN1207065A Improved process and equipment for lining concrete pipes |
| 12/23/1998 | WO1998057786A1 A plant for casting pipes, in particular of concrete |
| 12/10/1998 | WO1998056048A1 Shaped body consisting of textured supraconductor material and method for producing the same |
| 12/03/1998 | DE19722779A1 Formkörper aus texturiertem Supraleitermaterial und Verfahren zu ihrer Herstellung Shaped body of textured superconductor material and method for its preparation |
| 12/02/1998 | EP0881061A1 Device and process for making ceramic tubes |
| 11/25/1998 | CN1200166A Modular sleeve for protecting repairing or renovating a pipe |
| 11/18/1998 | CN1040792C Sealing device, mould element and pipe |
| 10/29/1998 | DE19717097A1 Method of marking sewage pipes during production |
| 10/27/1998 | US5828942 Covering moldings with water impermeable rubber film, drawing a vacuum inside the rubber film, cold isostatically pressing the moldings with rubber envelop in liquid medium |
| 10/22/1998 | DE19716292A1 Extrusion press |
| 10/07/1998 | EP0868272A1 Improved process and equipment for lining concrete pipes |
| 10/07/1998 | EP0868271A1 Process and device for making a pipe |
| 09/09/1998 | CN1192396A Inorganic glass-fiber reinforced plastic pipeline, and prodn. process therefor |
| 09/01/1998 | US5800756 Methods for manufacturing containers and other articles from hydraulically settable mixtures |
| 08/27/1998 | WO1998036886A1 Corrosion resistant concrete pipe and process and apparatus for making the pipe |
| 08/26/1998 | EP0675787B1 A production system for automatic casting of hollow bodies, in particular of concrete |
| 08/26/1998 | CN2288831Y Self-stress reinforced concrete quick repairing pipe |
| 08/11/1998 | US5792484 Automated feed system for pipe making machine |
| 08/05/1998 | EP0856117A1 Modular sleeve for protecting, repairing or renovating a pipe |
| 08/05/1998 | EP0855951A1 A collapsible core |
| 07/14/1998 | US5779966 Method for manufacturing ceramic bell and spigot pipe moldings |
| 06/16/1998 | US5766525 Methods for manufacturing articles from sheets of unhardened hydraulically settable compositions |
| 06/10/1998 | EP0779855B1 Method and device for producing pipes or tubular moulded bodies from polymer concrete |