| Patents for B28B 21 - Methods or machines specially adapted for the production of tubular articles (3,281) |
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| 09/25/1991 | CN1054758A Method for making float stone stovepipe |
| 09/24/1991 | US5051223 Method for the production of concrete pipes |
| 09/05/1991 | WO1991013214A1 Manholes and inspection chambers |
| 09/03/1991 | CA1288208C Method and apparatus for forming shaped pieces of insulation |
| 08/27/1991 | US5043116 Process for producing one end-sealed ceramic double wall-structural tubes |
| 08/21/1991 | EP0442587A1 Moulding apparatus |
| 08/20/1991 | US5040968 Device for manufacturing concrete parts |
| 08/07/1991 | EP0440591A2 Method for producing a concrete pillar |
| 08/06/1991 | US5037600 Method of applying a polyolefin coating to pipe |
| 07/30/1991 | WO1991011653A1 A method and apparatus for coating the outer surface of an elongated body with a layer of concrete |
| 07/30/1991 | US5035850 Casting A Mixture Of A Hydrophilic Resin And A Hardener To Form A Corrosion Protective Resin Layer On An Inner Surface |
| 07/24/1991 | CN2081338U Thin cement well pipe |
| 07/17/1991 | EP0437163A2 Densifier and homogenizing cylinder for making sheets and pipes from asbestos cement |
| 07/02/1991 | US5028368 Method of forming lined pipe |
| 06/26/1991 | CN2079559U Vertical screw extruding machine for tube |
| 06/12/1991 | EP0431055A1 Spacer which can be embedded in concrete |
| 06/06/1991 | DE3939447A1 Concrete drain-pipe prodn. system - involves rotating inner cylindrical mould and bar-shaped vibrating member |
| 05/29/1991 | EP0429389A2 Process of and apparatus for forming concrete pipe with step |
| 05/22/1991 | EP0428195A1 A process of protecting the spigot of concrete pipes |
| 05/21/1991 | US5016348 Process for the manufacture of a tubular crankshaft |
| 05/14/1991 | CA1284020C Concrete pipe making machine |
| 05/08/1991 | CN2076472U Continuous shaper for low-pressure water delivering soil-cement pipe |
| 05/07/1991 | US5013501 Branched pipes |
| 04/16/1991 | US5008045 Means for removal of heat; non-cylindrical shapes for dense compaction |
| 04/11/1991 | DE3932759A1 Mould work and formwork for circular concrete sections - incorporates projecting in-built iron components and uses clamps and sectional components at insert positions |
| 03/06/1991 | EP0215901B1 High speed pipe lining method and apparatus |
| 02/26/1991 | US4996013 Method for rapid molding of elongate concrete articles |
| 02/12/1991 | US4992640 Wire electric discharge machining apparatus |
| 02/06/1991 | EP0227753B1 Rapid moulding of hollow elongate concrete articles |
| 01/31/1991 | DE4022266A1 Automatic feeding of sealing rings onto pipe sockets - in which seal holder automatically drops and pushes seals onto sockets through separate stop and holding rings |
| 01/24/1991 | DE4022089A1 Casting concrete pipes by vibration process - uses cylindrical mould with vibrators mounted inside mould core |
| 01/16/1991 | EP0407786A1 Transfer tube with insitu heater |
| 01/16/1991 | EP0407632A1 Process for making concrete pipes and press therefor |
| 01/10/1991 | CA2012235A1 Transfer tube with insitu heater |
| 01/09/1991 | EP0406612A1 Process and equipment for realizing reinforced concrete pipes |
| 01/02/1991 | CN1048188A Concrete pipe-manufacturing machine |
| 01/02/1991 | CN1048187A Construction process of continuously cast-in-situ concrete pipeline and its cast spreader |
| 01/02/1991 | CA1278535C Prestressed concrete articles |
| 01/01/1991 | US4981740 Acid resistant concrete articles, especially sulfur concrete pipes, and a method of manufacturing said articles |
| 12/19/1990 | CN2067639U Machine for producing concrete pipe |
| 12/12/1990 | CN1010755B Underground concrete-pipe extruder |
| 12/11/1990 | US4976291 Cylindrical concrete layer, corrosion resistance protective coating |
| 11/21/1990 | CN1047047A Production technology for inorganic composite material water transport pipe |
| 11/15/1990 | WO1990013405A1 Aluminium oxide tubes and process for manufacturing them |
| 11/15/1990 | DE3915428A1 Aluminiumoxidrohre und verfahren zu ihrer herstellung Alumina tubes and process for their production |
| 11/14/1990 | EP0396694A1 Process for manufacturing an annular concrete workpiece, in particular a shaft ring |
| 10/30/1990 | CA1275617C Coated metal pipe having bending capability |
| 10/24/1990 | EP0393433A2 Process for lining the inner wall of a concrete pipe and device for carrying out this process |
| 10/24/1990 | CN1046306A Acid resistant concrete articles especially sulphur concrete pipes and a method of manufacturing them |
| 10/23/1990 | US4965107 One end-sealed ceramic double wall-structural tubes |
| 10/17/1990 | CN2063867U Self-motion double stirring extrusion |
| 10/10/1990 | EP0128913B1 Plant for the continuous and automated manufacturing of agglomerated, sintered, vulcanized and pressed articles |
| 10/10/1990 | CN2063473U Field continuously casting machine for concrete tube |
| 09/26/1990 | EP0389089A2 Method and apparatus for centrifugally casting hazardous waste |
| 09/26/1990 | CN1045573A Special ceramic refractory annular tubes |
| 09/23/1990 | CA2008836A1 Method and apparatus for centrifugally casting hazardous waste |
| 09/20/1990 | DE4007189A1 Making columns, etc. for building industry - by placing longitudinally slit reinforced cylinder in half sleeve, casting e.g. concrete, fixing top half sleeve, and centrifuging |
| 09/19/1990 | EP0388391A1 Method of impregnating cement products, and products produced thereby |
| 09/19/1990 | EP0388347A2 Concrete pipe making machine |
| 09/19/1990 | EP0302853B1 In-mold label dispenser for plastic blow molding machine |
| 09/19/1990 | EP0299953B1 In-mold label dispenser of blow molding machine |
| 09/18/1990 | US4957424 Concrete pipe making machine |
| 09/13/1990 | CA2001399A1 Concrete pipe making machine |
| 09/12/1990 | EP0386949A2 Ceramic tubes and their manufacture |
| 09/12/1990 | EP0386428A2 Process and equipment for lining concrete pipes |
| 09/11/1990 | WO1990010606A1 Acid resistant concrete articles, especially sulphur concrete pipes and a method of manufacturing them |
| 09/11/1990 | CA2048643A1 Acid resistant concrete articles, especially sulphur concrete pipes and a method of manufacturing them |
| 09/10/1990 | CA2011190A1 Ceramic tubes and their manufacture |
| 08/16/1990 | EP0382181A2 Concrete tubing reinforced with glass fibres and plastic material nets |
| 08/15/1990 | CN2060496U Pipeline attatched to wall |
| 08/08/1990 | EP0380474A1 Method and apparatus for coating pipes. |
| 08/07/1990 | US4946082 Transfer tube with in situ heater |
| 08/02/1990 | DE4002191A1 Spark erosion machine with laterally apertured vessel - delivers working fluid through gap between electrode arm and enclosing sealing sleeve |
| 07/19/1990 | DE3900873A1 Plug-in socket seal which is concreted into a pipe socket |
| 07/17/1990 | US4941643 Apparatus for forming inverts and manhole assemblies and the like utilizing adjustable invert forming members joined with an intermediate flexible portion |
| 07/04/1990 | CN1043551A Indoor drainage pipe and its manufacture |
| 06/27/1990 | EP0375294A2 Method of producing ceramic manifolds for thermally insulating exhaust channels |
| 06/27/1990 | EP0374667A1 Process and installaton for making a composite pipe in a rotating mould |
| 06/26/1990 | US4936006 Method of making prestressed concrete articles |
| 06/26/1990 | CA1270624A1 Method and device for the casting of concrete products |
| 06/23/1990 | CA2006518A1 Method and apparatus for producing a composite pipe in a rotating drum |
| 05/29/1990 | US4929127 Drill bit for producing drilled holes with an undercut |
| 05/17/1990 | WO1990005051A1 Process for manufacturing an annular concrete workpiece, in particular a shaft ring |
| 05/08/1990 | US4923655 Sealing of end faces of ceramic tubes |
| 04/18/1990 | EP0364028A1 Tubular camshaft manufacturing process |
| 03/14/1990 | EP0358256A1 A sealing and protective device for pipes |
| 03/08/1990 | WO1990002234A1 Spacer which can be embedded in concrete |
| 03/07/1990 | EP0356922A1 Spacer embedded in concrete |
| 02/07/1990 | EP0244404B1 A method of casting concrete objects and a form herefor |
| 02/07/1990 | CN2052338U Grinding head for cement pipe making machine |
| 01/17/1990 | EP0351325A1 Apparatus for making a ring-shaped element from concrete, in particular for lining a shaft |
| 01/17/1990 | CN2051155U Earthen pipe blank forming machine capable of forming multiple pipe simultaneously |
| 01/03/1990 | CN2050371U Shapping arrangement by rotating extrusion for concrete inserting pipes |
| 12/27/1989 | EP0347962A2 Tube having a structure made from cement, method and machine for manufacturing it |
| 12/27/1989 | EP0347556A1 Drilling tool for manufacturing drilled holes with recesses |
| 12/20/1989 | CN2049592U Shaper for forming concrete water drain pipe by internal vibration and core drawing down |
| 12/13/1989 | CN2049182U Moving concrete drain-pipe moulders |
| 12/07/1989 | DE3818064A1 Sealing on precast concrete compound units which can be plugged together |
| 12/05/1989 | US4885018 Molding suspension of solids in dispersing agent while mold is rotated |
| 11/29/1989 | EP0343677A1 Sealing means between two interengaging concrete pre-casts |