| Patents for B28B 21 - Methods or machines specially adapted for the production of tubular articles (3,281) |
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| 11/28/1989 | US4883416 Slip-form casting machine for fabrication of elongated concrete products |
| 11/23/1989 | EP0342657A2 Shuttering for simultaneously making several arc-shaped elements from concrete or the like. |
| 11/14/1989 | US4880598 Method for manufacturing a tubular compact |
| 11/02/1989 | EP0340185A2 Production method for a concrete pillar or beam |
| 10/11/1989 | CN1036164A Forming method of concrete pipe with smooth inner wall |
| 10/03/1989 | US4871180 Seal construction in bell and spigot type concrete pipe connection |
| 09/28/1989 | DE3808450A1 Apparatus for shaping a concrete pipe socket |
| 09/26/1989 | CA1259814A1 Concrete structural elements, process and device for manufacturing these elements |
| 08/31/1989 | DE3805550A1 Process and apparatus for producing concrete parts |
| 08/30/1989 | EP0329856A2 Apparatus for making concrete articles |
| 08/17/1989 | DE3903640A1 Process and installation for producing hollow bodies from building material mixtures, preferably concrete mixtures |
| 08/17/1989 | DE3803637A1 Arrangement for manufacturing concrete parts |
| 08/15/1989 | US4857245 Method of drying ceramic cylindrical bodies |
| 08/09/1989 | CN1034502A Bell and spigot cement pipe shaping machine |
| 07/27/1989 | DE3801748A1 Plug-in-socket seal |
| 07/13/1989 | DE3843698A1 Arrangement for producing concrete pipes |
| 07/12/1989 | EP0153785B1 Process for producing tubular bodies and device for carrying out the process |
| 07/04/1989 | US4844855 Method for producing a centrifugally cast concrete product |
| 06/28/1989 | EP0180625B1 Barrier with internal ducts and construction method |
| 06/21/1989 | EP0321430A1 Method for producing a tubular compact and apparatus for carrying out said method |
| 05/24/1989 | CN2038052U Multiunit tube with aluminate concrete and sheet steel |
| 04/20/1989 | WO1989003289A1 Method and apparatus for coating pipes |
| 04/19/1989 | EP0311720A1 Method and apparatus for coating pipes |
| 04/13/1989 | DE3744566C1 Arrangement for the production of concrete sewage pipes having house connection branches |
| 03/23/1989 | DE3742946A1 Process and apparatus for producing concrete parts |
| 03/22/1989 | CN2034516U Producing equipment of concrete waterpipe |
| 03/15/1989 | CN1031672A Underground concrete-pipe extruder |
| 03/08/1989 | CN2033736U Tube-making machine by using underground soil |
| 03/07/1989 | US4810458 Tubes, rods; floating state by air pressure jets |
| 02/23/1989 | DE3826599A1 Tube core support for a tube winding installation |
| 02/23/1989 | DE3726568A1 Arrangement for manufacturing tubes consisting of semiconductor material |
| 02/15/1989 | EP0302853A1 In-mold label dispenser for plastic blow molding machine. |
| 02/08/1989 | CN2032127U Vertical tube extruding machine |
| 01/31/1989 | US4801417 Methods for forming inverts in manhold assemblies |
| 01/31/1989 | US4801415 Simultaneously compacting and consolidating pieces of different thickness |
| 01/25/1989 | EP0299953A1 In-mold label dispenser of blow molding machine. |
| 01/17/1989 | US4798698 Closed loop system for the manufacture and handling of concrete pipe |
| 01/17/1989 | CA1248719A1 In-mold label dispenser for plastic blow molding machine |
| 01/11/1989 | CN2030537U Spigot-and-socket cement pipe-forming machine |
| 01/10/1989 | US4797082 Apparatus for forming shaped pieces of insulation |
| 01/05/1989 | DE3721077A1 Device for producing elongated hollow articles, in particular pipes, from concrete or reinforced concrete |
| 12/28/1988 | CA1247322A Installation for continuous and automated manufacture of agglomerated, sintered, cured and compacted articles |
| 12/21/1988 | EP0295938A2 Slip-form casting machine for fabrication of elongated concrete products |
| 12/06/1988 | US4789506 Method of producing tubular ceramic articles |
| 11/23/1988 | EP0302853A4 In-mold label dispenser for plastic blow molding machine. |
| 11/23/1988 | EP0299953A4 In-mold label dispenser of blow molding machine. |
| 11/22/1988 | US4785854 Method of coating metal pipe having bending capability |
| 11/01/1988 | US4781579 Process for changing the color of partial areas of the surface of pigmented hydraulically bonded construction elements |
| 11/01/1988 | CA1243870A1 Barrier with internal ducts and construction method |
| 10/20/1988 | WO1988007934A1 Prestressed concrete articles and methods for manufacturing such articles |
| 10/19/1988 | CN88101607A Concrete compound pipe and its method of manufacture |
| 10/18/1988 | CA1243216A1 Slide action inside corner form |
| 10/06/1988 | WO1988007445A1 Process for manufacturing concrete pipes with expanded joint formed by a so-called neck ring |
| 09/28/1988 | EP0284317A1 Concrete-type composite pipe and a method of producing the same |
| 09/20/1988 | US4771530 Application of inwardly directed prestressing pressure to concrete members |
| 08/03/1988 | EP0276886A1 Method and apparatus for producing rotationally symmetric porous solid bodies |
| 08/03/1988 | EP0276785A2 Manufacture of sealable and insertable concrete pipes |
| 07/26/1988 | US4759390 Coated metal pipe having bending capability |
| 07/12/1988 | US4756861 Mold containing lower curing pallet, support, vibrator tube, rotator, vibrator ring having selectively engageable means to connect ring to pallet |
| 06/30/1988 | DE3642880A1 Plug-in seal which is concreted into the socket wall of a pipe |
| 06/23/1988 | DE3642758A1 Process for producing pipes |
| 06/21/1988 | US4752203 Casting frame structure of centrifugal casting machine |
| 06/15/1988 | EP0271239A1 Coated metal pipe having bending capability |
| 05/19/1988 | EP0227753A4 Rapid moulding of hollow elongate concrete articles. |
| 05/19/1988 | DE3639107A1 Operating process for producing lateral branches on concrete pipes, in particular sewer pipes, and diamond drilling tool for this purpose |
| 05/19/1988 | DE3638547A1 Variable socket shuttering for concrete pipes |
| 05/10/1988 | CA1236350A1 High speed pipe lining method and apparatus |
| 04/14/1988 | DE3633534A1 Device for fastening a spacer |
| 04/12/1988 | US4737094 Molding device for shaping concrete parts |
| 03/10/1988 | DE3713207A1 Pipe, in particular for the transport of aggressive liquids, and process for the production thereof |
| 02/24/1988 | CN85106841B Filler set of machine for mfg. concrete pipe |
| 02/18/1988 | DE3626607A1 Device for producing concrete mouldings, in particular concrete rings |
| 02/16/1988 | US4725391 Mixture of ceramic, binder, oxidizing agent and matrix precursor extruded into sulfur dioxide, forming sulfur trioxide polymerization catalyst in situ |
| 02/16/1988 | US4725165 Pipeline jointing |
| 02/16/1988 | CA1232745A1 Method and apparatus for manufacturing cylindrical ceramic tubes having localized imprints on their inner faces |
| 01/28/1988 | DE3624831A1 Socket shuttering for pipes |
| 01/13/1988 | EP0252072A1 Method and device for fabricating hollow bodies made of continuous fibre-reinforced concrete, and products obtained thereby |
| 01/12/1988 | CA1231222A1 Method and apparatus for lining pipe |
| 12/29/1987 | CA1230736A1 Method and apparatus for production of concrete pipe by the packerhead method |
| 12/23/1987 | DE3620909A1 Machine for producing vibratory concrete pipes |
| 12/22/1987 | US4714420 Plant for the continuous and automated manufacturing of agglomerated sintered, vulcanized and pressed articles |
| 12/16/1987 | CN87104060A 挤压模 Extrusion die |
| 12/09/1987 | EP0248560A1 Extrusion die |
| 12/01/1987 | US4710115 Cage positioning device for use with a concrete pipe form |
| 11/26/1987 | DE3617466A1 Socket formwork for the production of push-in sockets on pipes |
| 11/24/1987 | US4708621 Concrete pipe making machine |
| 11/24/1987 | US4708530 Concrete foundation pile and device for driving the same into the ground |
| 11/12/1987 | DE3619973C1 Process for producing a jacketed pipe |
| 11/11/1987 | EP0244404A1 A method of casting concrete objects and a form herefor. |
| 11/03/1987 | US4704082 Isostatic press mold for producing moldings from ceramic material |
| 10/28/1987 | EP0242860A1 Abrasion resistant pipe and method of producing the same |
| 10/27/1987 | US4702282 Reinforced conventional concrete pipe having an evenly distributed steel wire reinforcement |
| 09/23/1987 | EP0145781B1 Means for sealing the gap between two axially displaceable sealing surfaces |
| 09/22/1987 | US4694622 Concrete structural elements, process and device for manufacturing these elements |
| 09/11/1987 | WO1987005254A1 In-mold label dispenser for plastic blow molding machine |
| 09/11/1987 | WO1987005253A1 In-mold label dispenser of blow molding machine |
| 09/01/1987 | US4690631 Machine for making concrete pipe in an upright mold |
| 09/01/1987 | US4690414 Means for sealing the gap between two axially displaceable sealing surfaces |
| 08/18/1987 | US4686756 Method of producing a self aligning pipe with configured joint |
| 08/11/1987 | US4685873 Process for the continuous production of pipe from particulate materials |