| Patents for B28B 21 - Methods or machines specially adapted for the production of tubular articles (3,281) |
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| 08/11/1987 | US4685650 Apparatus for forming inverts and manhole assemblies |
| 07/23/1987 | DE3601086A1 Storage and transportation guard for a mounting groove |
| 07/08/1987 | EP0227753A1 Rapid moulding of hollow elongate concrete articles. |
| 07/02/1987 | DE3541659A1 Shaping apparatus for the production of annularly closed concrete parts, especially tubbing rings, taper shaft rings or the like |
| 07/01/1987 | EP0227083A1 Casting frame structure of centrifugal casting machine |
| 06/23/1987 | US4674913 Apparatus for construction of continuous article having bores |
| 06/11/1987 | DE3542802A1 Plug-in sleeve seal for pipes |
| 06/04/1987 | DE3542427A1 Socketed-pipe connection |
| 04/23/1987 | WO1987002301A1 Method and device for fabricating hollow bodies made of continuous fibre-reinforced concrete, and products obtained thereby |
| 04/14/1987 | US4657794 Binderless ceramic or ceramic oxide hollow body and method for its manufacture |
| 04/14/1987 | US4657498 Apparatus for lining pipe |
| 03/24/1987 | US4651395 Manufacture of piston rings |
| 03/12/1987 | DE3532415A1 Plug-in seal for socket pipes |
| 03/11/1987 | CN85106841A Filler set of machine for mfg. concrete pipe |
| 03/04/1987 | EP0212872A2 Method and apparatus for forming shaped pieces of insulation |
| 03/04/1987 | EP0212763A2 Means for sealing the gap between two axially displaceable sealing surfaces |
| 02/18/1987 | CN86104824A Improvements relating to rapid moulding of elongate concrete articles |
| 02/10/1987 | US4641993 Highway barrier with level internal ducts and construction method |
| 01/27/1987 | US4639342 Combined concrete feed and packerhead lift control |
| 01/13/1987 | CA1216505A1 Method and apparatus for applying a coating material to a pipe |
| 01/06/1987 | US4633568 Method of manufacturing reinforced concrete pipe having an evenly distributed steel wire reinforcement |
| 12/31/1986 | WO1986007559A1 Rapid moulding of hollow elongate concrete articles |
| 12/30/1986 | US4632720 Apparatus for preparing an annular body of a hydraulically setting mass |
| 12/02/1986 | CA1214733A1 Coated pipe having bending capability |
| 10/21/1986 | US4618122 Core segment for concrete forming apparatus |
| 10/09/1986 | WO1986005737A1 High speed pipe lining method and apparatus |
| 10/02/1986 | EP0180625A4 Barrier with internal ducts and construction method. |
| 09/30/1986 | US4614324 Mold for producing concrete pipe |
| 09/23/1986 | CA1211620A1 Concrete pipe sealing apparatus and method |
| 09/17/1986 | CN85105541A Reinforced conventional concrete pipe having an evenly distributed steel wire reinforcement and method for its manufacture |
| 09/16/1986 | US4611635 Coated pipe having bending capability |
| 09/09/1986 | US4610422 Moulding apparatus for shaping concrete parts |
| 09/03/1986 | EP0192884A1 Method and device for the slide-casting of concrete hollow products |
| 08/27/1986 | CN85205262U Pipe and its mouthing-making machine with one-extrusion moulding |
| 07/22/1986 | US4601923 Mold for manufacturing objects by a centrifugal casting method |
| 07/15/1986 | US4600548 Method of forming the primary core of a prestressed concrete pipe |
| 07/15/1986 | US4600373 Concrete pipe machine |
| 07/09/1986 | EP0187135A2 Process for changing the colour of part of the surface of pigmented, hydraulic bonded building articles |
| 07/01/1986 | US4597995 High speed pipe lining method and apparatus |
| 06/04/1986 | EP0183656A2 A reinforced conventional concrete pipe having an evenly distributed steel wire reinforcement and method for its manufacture |
| 06/03/1986 | US4592674 Concrete manhole |
| 05/22/1986 | WO1986002875A1 A method of casting concrete objects and a form herefor |
| 05/14/1986 | EP0180625A1 Barrier with internal ducts and construction method. |
| 05/13/1986 | US4588544 Method and apparatus for forming concrete articles containing one or more projecting elements |
| 05/07/1986 | CN85202492U Mud forming die for catalyst honeycomb carrier |
| 04/29/1986 | US4585408 In-mold label dispenser for plastic blow molding machine |
| 04/15/1986 | US4582474 In-mold label dispenser of blow molding machine |
| 04/01/1986 | US4579707 Method for producing a thin-walled ceramic tube |
| 03/26/1986 | EP0175635A2 High density moisture resistant mica cylinders |
| 03/25/1986 | US4578235 Corrosion resistant lining-concrete |
| 03/19/1986 | CN85201562U Inserting earthenware pipe blank one time forming machine |
| 03/04/1986 | CA1201278A1 Mould portion and/or protective element as well as a method and a device for manufacturing the same |
| 02/19/1986 | EP0172093A1 Structural elements of compressed concrete, and apparatus for making them |
| 02/18/1986 | US4570896 Slide action inside corner form |
| 01/21/1986 | US4565381 Self aligning concrete pipe with configured joint |
| 12/31/1985 | US4562030 Process for manufacture of glass fiber-reinforced cement non-plate article |
| 12/24/1985 | CA1198262A1 Quick-strip groove former |
| 11/21/1985 | WO1985005136A1 Barrier with internal ducts and construction method |
| 11/19/1985 | CA1196772A1 Metal vapor discharge lamp tube molding die and forming method |
| 11/19/1985 | CA1196771A1 Process for the manufacture of articles consisting of ceramic material and equipment for carrying out the process |
| 11/12/1985 | US4552384 Molded-joint assembly |
| 11/06/1985 | EP0160170A1 Method and device for manufacturing tubbing rings or the like |
| 10/29/1985 | CA1195829A1 Apparatus for manufacturing concrete pipes |
| 10/15/1985 | US4547415 Controlling temperature gradients to produce layers of fused particles |
| 10/09/1985 | EP0157506A1 Improvements in or relating to the production of concrete pipes |
| 09/17/1985 | US4541976 Method of manufacturing cylindrical ceramic tubes having localized imprints on their inner faces |
| 09/11/1985 | EP0154038A1 Moulding core with adjustable parts |
| 09/10/1985 | US4540539 Method and apparatus for production of concrete pipe by the packerhead method |
| 09/04/1985 | EP0153816A2 Coated pipe having bending capability |
| 09/04/1985 | EP0153785A2 Process for producing tubular bodies and device for carrying out the process |
| 08/21/1985 | EP0152040A2 Slide action inside corner form |
| 07/23/1985 | US4530378 Composite tubular body |
| 07/02/1985 | US4526208 Tile-lined pipe with subdivided tiles therein and methods of production thereof |
| 06/26/1985 | EP0145781A1 Means for sealing the gap between two axially displaceable sealing surfaces. |
| 06/18/1985 | US4524039 Panels, roof decks, pipes |
| 06/11/1985 | US4522772 Moulding of articles |
| 06/11/1985 | US4522669 Prevent access of soil and water to the surface during transportation and storage |
| 06/11/1985 | US4522579 Apparatus for making reinforced concrete products |
| 05/02/1985 | EP0139007A1 Apparatus for forming continuous body with hole |
| 04/23/1985 | CA1185771A1 PREPARATION OF .beta. ALUMINA TUBES BY THE EXTRUSION PROCESS |
| 04/03/1985 | EP0136048A1 Method and apparatus for applying a coating material to a pipe |
| 03/26/1985 | CA1184582A1 Insulated joint and method for producing same |
| 03/19/1985 | US4505658 Mechanism for centering reinforcing mesh |
| 03/12/1985 | US4504428 Wire rods |
| 03/12/1985 | CA1183741A1 Manufacture of piston rings |
| 01/29/1985 | US4496501 Process and apparatus for the production of articles consisting of ceramic material |
| 01/17/1985 | WO1985000211A1 Means for sealing the gap between two axially displaceable sealing surfaces and method for manufacturing the same |
| 01/02/1985 | CA1180168A Apparatus for forming an annular groove in the end of cast concrete pipe |
| 01/02/1985 | CA1180167A Apparatus for stripping the jacket from cast concrete |
| 12/27/1984 | EP0128913A1 Plant for the continuous and automated manufacturing of agglomerated, sintered, vulcanized and pressed articles. |
| 12/05/1984 | EP0127593A2 Device which can be enlarged with a controlled expansion |
| 12/05/1984 | EP0127221A1 Concrete foundation pile and device for driving the same into the ground |
| 11/27/1984 | US4484969 Method of winding tile-lined piped with subdivided tiles therein |
| 09/27/1984 | WO1984003726A1 Apparatus for forming continuous body with hole |
| 09/18/1984 | US4472335 Method for preparing an annular body of a hydraulically setting mass |
| 08/28/1984 | US4467995 Spacer bar and related method for concrete pipe manufacture |
| 08/28/1984 | CA1173220A2 Method and apparatus for making reinforced concrete products |
| 08/21/1984 | CA1172871A1 Circumferential stirrup panel |
| 08/02/1984 | WO1984002493A3 Plant for the continuous and automated manufacturing of agglomerated, sintered, vulcanized and pressed articles |
| 07/18/1984 | EP0050114B1 Moulding of articles |