| Patents for B28B 21 - Methods or machines specially adapted for the production of tubular articles (3,281) |
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| 12/01/1993 | CN1078936A Walking type instant demoulding concrete drain pipe forming machine |
| 11/30/1993 | US5266557 Method of fabricating superconducting ceramic pipe |
| 11/18/1993 | EP0569715A1 Process for the production of tube shaped mouldings out of high temperature superconductor material |
| 11/16/1993 | US5261995 Pipe wrapping apparatus and method |
| 11/15/1993 | CA2096059A1 Improved process for the production of cement slabs |
| 11/10/1993 | CA2094559A1 Process for producing tubular moldings from high-temperature superconducting material |
| 11/03/1993 | CN2145102Y Vertical cement pipe manufacturing machine |
| 10/28/1993 | WO1993020961A1 Process and device for the continuous production of cylindrical rods with at least one internal helical channel, and sinter blank made by this process |
| 10/21/1993 | DE4210994A1 Vibrator for roll-and-press appts. mfg. concrete pipes - is based on crossed beams of steel vibrated vertically by eccentric electric actuators mounted on central circular plate |
| 10/14/1993 | WO1993019913A1 A mould device for casting concrete well rings or cones having ladder steps |
| 10/12/1993 | US5251867 For the selective production of the spigot of a concrete pipe |
| 10/05/1993 | US5250113 Dry castable concrete compositions and methods of preparing and dry casting the same |
| 09/30/1993 | DE4209594A1 Producing concrete tubes, shaft elements, etc. - using screw feeds to meter binder and additive to concrete mass in container which is used as feeder device to fill mould |
| 09/28/1993 | US5248248 Machine for making concrete pipes |
| 09/21/1993 | US5245895 Method and apparatus for automatically tightening and untightening a bolt |
| 08/25/1993 | EP0557262A1 Casting mold for a concrete column or beam |
| 08/24/1993 | US5238384 Apparatus for producing a composite pipe in a rotating drum |
| 08/17/1993 | US5236322 Cage positioner |
| 08/10/1993 | US5234713 Inclined upward and rotated around an axis while straying or flowing resin |
| 08/10/1993 | US5234331 Automated pipe making machine |
| 07/20/1993 | US5229024 Apparatus for making concrete pipe |
| 07/20/1993 | CA1320337C Vibrator type concrete pipe making machines having combined lubrication and cooling system and method of operation thereof |
| 07/13/1993 | US5227105 Process for manufacturing ceramic tubes |
| 06/08/1993 | CA1318819C Method and apparatus for coating pipes |
| 06/01/1993 | US5215673 Apparatus for the production of a symmetrical oval concrete pipe |
| 05/27/1993 | DE4238878A1 Hollow rotationally symmetrical ceramic article prodn. - by centrifugal casting of chemically bonded ceramic material |
| 05/19/1993 | CN1072129A Manufacturing method of pipe |
| 04/29/1993 | DE4134049A1 Seal for concrete pipes with elastomer ring - has axially undivided free space holding ring and pointed end of other pipe |
| 04/22/1993 | DE4227196A1 Method for prodn. of concrete pipes - comprises vibrator unit integrated in roller head and is fitted radially to drive shaft, transmits vibrations to press roller |
| 04/14/1993 | EP0536911A1 Mandrel and a method of making a rigid tubular article |
| 04/09/1993 | CA2077400A1 Mandrel and a method of making a rigid tubular article |
| 04/07/1993 | EP0145781B2 Means for sealing the gap between two axially displaceable sealing surfaces |
| 02/24/1993 | EP0528334A1 Device for making tubular concrete articles with reinforcing elements |
| 02/18/1993 | WO1993003241A1 Corrosion resistant coated steel pole |
| 02/09/1993 | US5185113 Slip-cast ceramic component and a process for its production |
| 02/01/1993 | CA2073952A1 Dry castable concrete compositions and methods of preparing and dry casting the same |
| 01/26/1993 | US5182052 Method of manufacturing tubes and device for carrying out the method |
| 01/20/1993 | CN1068061A Centrifugal molding method for composite pipe having resin concrete layer and for resin concrete pipe |
| 01/05/1993 | US5176869 Method of manufacturing an inner lined pipe |
| 12/24/1992 | DE4120483A1 Manhole lining made in concrete - has waste water passage formed in floor with holes made in walls after removal from mould |
| 12/16/1992 | CN2124806U Forced vertical spinning concrete pipe-making machine |
| 12/01/1992 | US5167967 Machine for making concrete pipes |
| 11/25/1992 | EP0515098A2 Method of producing patterned shaped article |
| 11/24/1992 | CA2068746A1 Method of producing patterned shaped article |
| 11/19/1992 | EP0513088A1 A method and apparatus for coating the outer surface of an elongated body with a layer of concrete. |
| 11/12/1992 | DE4108107A1 Sealing ring for bell joint construction of concrete pipes - seals positioned before concrete cast and form integral part of the pipe |
| 10/29/1992 | WO1992018308A1 A machine for casting hollow bodies, in particular concrete pipes, and comprising two mutually axially movable slip-form mould parts |
| 10/29/1992 | WO1992018307A1 A machine for casting hollow objects, in particular concrete pipes, and comprising two mutually axially movable mould parts |
| 10/20/1992 | WO1992018309A1 A machine for vertical casting of pipes of concrete or a similar material in a mould system with a distributor wheel |
| 10/20/1992 | CA2108675A1 A machine for vertical casting of pipes of concrete or a similar material in a mould system with a distributor wheel |
| 10/14/1992 | EP0508875A1 Prefabricated tubular element |
| 10/07/1992 | EP0507005A2 A pipe joint |
| 09/23/1992 | CN1064720A Method of manufacturing hollow concrete pile and apparatus for manufacturing same |
| 09/15/1992 | US5147196 Machine for making concrete pipes |
| 09/02/1992 | EP0380474B1 Method and apparatus for coating pipes |
| 08/18/1992 | US5139404 Apparatus for making lined pipe |
| 07/23/1992 | WO1992011981A1 Process and device for producing moulded parts from moulding compound |
| 07/15/1992 | CN2109928U Quick drawing patterns cement tube vibration make-up device |
| 07/09/1992 | DE4100161A1 Verfahren und vorrichtung zum herstellen von formteilen aus formmasse Method and apparatus for the manufacture of molded parts from molding compound |
| 07/08/1992 | CN1017361B Construction process of continuously cast-in-situ concrete pipeline and its cast spreader |
| 06/30/1992 | US5125822 Apparatus for the production of ceramic articles |
| 06/24/1992 | CN1062112A Concrete water pipe construction method and its seal capsule for irrigation in mountain area |
| 06/17/1992 | CN1061928A Method of producing patterned shaped article |
| 06/10/1992 | EP0489302A1 Apparatus for making manholes |
| 06/03/1992 | EP0488763A1 Method of applying a resin lining to the inner surface of a porcelain housing |
| 06/03/1992 | CN2106056U Castor device for centrifugal machine |
| 06/03/1992 | CN1061557A Concrete parting agent and making method thereof |
| 05/31/1992 | CA2055988A1 Method of lining resins on inner surface of porcelain housing |
| 04/22/1992 | EP0481284A1 Method and apparatus for automatically tightening and untightening a bolt |
| 04/22/1992 | CN2102193U Cement worksite pipe making machine |
| 04/22/1992 | CN2102192U Agriculture irrigation pipe in site pouring construction equipment |
| 04/21/1992 | US5106295 Device for holding a long shaped product made of ceramics during drying |
| 04/08/1992 | EP0479512A2 Method of producing patterned shaped article |
| 04/02/1992 | CA2052301A1 Method of producing patterned shaped article |
| 03/26/1992 | DE4029900A1 Mould for prodn. of concrete tubes - has cover which centres inner shell of mould with outer shell |
| 03/25/1992 | EP0476245A2 Process for making concrete products |
| 03/25/1992 | CN2099660U Fibre concrete high/low pressure special pipe |
| 03/24/1992 | US5098628 Centrifugal molding method for composite pipe having a resin concrete layer |
| 03/18/1992 | CN2099013U Machine for producting tubular articles under the ground |
| 03/18/1992 | CN1015924B Concrete compound pipe and its method of manufacture |
| 03/05/1992 | DE4027485C1 Ceramic mouldings for high strength components mfr. - obtd. in porous mould of plastic, inside which is body which can be rotated about its axis |
| 02/19/1992 | EP0471319A2 Concrete pipe |
| 02/12/1992 | CN1015493B Indoor drainage pipe and its manufacture |
| 01/21/1992 | US5082614 Method for producing a composite pipe in a rotating drum |
| 01/14/1992 | US5080571 Packerhead assembly |
| 01/01/1992 | CN1057544A Process for producing tubular molded parts made of hightemperature super-conductor material and also plant for carrying it out |
| 12/31/1991 | CA1293608C Casting frame structure of centrifugal casting machine |
| 12/27/1991 | EP0462473A2 Moulded ceramic products with hollow cavities |
| 12/27/1991 | EP0462409A1 Process for the production of tube shaped mouldings out of high temperature superconductor material and plant for carrying out this process |
| 12/27/1991 | EP0462193A1 Acid resistant concrete articles, especially sulphur concrete pipes and a method of manufacturing them |
| 12/11/1991 | CN2090289U Forming die for making refractory crucible with flute on internal wall |
| 12/10/1991 | US5071685 Ceramic articles, methods and apparatus for their manufacture |
| 11/28/1991 | DE4017000A1 Mould producing tubular ceramic articles - consists of hollow cylinder made of plaster of paris |
| 11/21/1991 | DE4015676A1 Production of ceramic branch pipe - involves mould consisting of two half shells |
| 11/19/1991 | US5065795 Prestressed concrete articles |
| 11/06/1991 | EP0455357A1 Method of applying an internal coating to pipe and the product made thereby |
| 10/31/1991 | CA2038683A1 Method of applying a polyolefin coating to pipe and the product made thereby |
| 10/15/1991 | US5057001 Apparatus for making ceramic tubes |
| 10/08/1991 | US5055021 Intermediate anchor for centrifugal concrete mold for producing ring-shaped prestressed concrete bodies |
| 10/02/1991 | EP0448810A2 Slip-casting process for the manufacture of a ceramic product |