| Patents for B28B 21 - Methods or machines specially adapted for the production of tubular articles (3,281) |
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| 02/13/2003 | DE10148574C1 Concrete shaft ring manufacturing method has equalization or sealing element lowered into concrete at end of shaft ring during limited pivot movement in alternating directions |
| 02/05/2003 | CN1100652C Slip casting technology for preparing electrolyte thin wall, and mother mould for making plaster |
| 01/15/2003 | CN2531001Y Hollow core slab hole forming extrusion type thin wall pipe |
| 01/15/2003 | CN1390692A Process for preparing isolating water agent of concrete |
| 01/02/2003 | US20030000059 Peeling apparatus of extrusion material batch |
| 12/25/2002 | CN1386618A Stripping device for extruded blank |
| 12/18/2002 | CN2526145Y Hollow pipe structural member |
| 12/04/2002 | EP1261467A2 Method and device for producing a straight cylindrical body by molding using a loose hardenable granular material and the utilization thereof for producing a tube |
| 12/04/2002 | EP1261465A1 Exterior mold |
| 11/27/2002 | EP1260337A1 Peeling apparatus of extrusion material batch |
| 11/20/2002 | EP1257400A1 A method and an apparatus for the manufacture of well equipment with permanently mounted ladder steps |
| 11/20/2002 | CN1380171A Large-aperture prestressed concrete pipe and its preparation process |
| 10/17/2002 | DE10118082A1 Elastic sealing ring applicator has rest for shaped rings formed by turntable |
| 10/15/2002 | US6464443 Installation for hardening tubular concrete workpiece |
| 10/10/2002 | US20020146523 Wrapping green ceramic around mandrel; laminating together wraps of green ceramic under pressure while still wrapped about mandrel; separating mandrel from laminated wraps; sintering separated laminated wraps to produce tubes |
| 09/25/2002 | CN2512571Y Producing mould for prestress concrete pipe |
| 09/18/2002 | CN1369364A Prestressed pressure concrete pipe without adhesion and its making method |
| 09/18/2002 | CN1369363A Technology for making thin-wall tube with reinforcing ribs for reinforced concrete |
| 08/21/2002 | EP0868272B1 Improved process and equipment for lining concrete pipes |
| 08/15/2002 | US20020109068 Valve for use in producing cast concrete articles |
| 08/14/2002 | EP0833697B1 Pipe coating apparatus |
| 07/31/2002 | CN1360998A Manufacture of core pipe for in-situ deposited hollow floor board |
| 07/25/2002 | US20020095757 Apparatus for pulling a molding ring off a neck of a concrete tubular workpiece |
| 07/18/2002 | US20020092262 Apparatus for the production of ring-shaped bodies from concrete |
| 07/17/2002 | EP1223014A1 Apparatus for manufactoring annular concrete bodies |
| 07/17/2002 | CN1087682C Technology for equipment for machining rotary tube |
| 07/10/2002 | CN2499968Y Vacuum switch tube porcelain casing part sealing mould |
| 07/09/2002 | US6415472 Circular edging tool for concrete |
| 07/03/2002 | CN2497963Y Assembled die for drainage pipeline |
| 06/20/2002 | DE10062530C1 Vorrichtung zur Herstellung von Formteilen aus einem verdichtungsfähigen Gemenge, Rütteltisch und Schwingungserreger Apparatus for producing molded parts from a compactable mixture, shaking table and vibrator |
| 06/19/2002 | EP1214988A2 Device for producing moulded parts from a compactable material; vibrating table and vibration generator |
| 06/19/2002 | CN2495442Y Equipment for forming composite pipe (or tube) |
| 06/19/2002 | CN1354077A Production method of rib stiffener hollow thin-wall pipe for reinforced concrete |
| 06/12/2002 | EP1212178A1 Method and apparatus for producing concrete products |
| 05/29/2002 | CN1085567C Apparatus for balanced adjustment of roll position in stands with two working rolls for longitudinal rolling mills |
| 05/28/2002 | US6395213 Apparatus and method for producing cast concrete articles |
| 04/24/2002 | EP1198437A1 Production of ceramic tubes with a radial orientation preference |
| 04/11/2002 | DE10047013A1 Method for making large diameter water pipes comprises producing core pipe consisting of sheet metal cylinder fitted with concrete lining and outer coating, winding this with steel strip and coating with flowable cement inside sleeve |
| 04/03/2002 | CN2484164Y Composited pipe forming production equipment |
| 02/07/2002 | WO2001051264A3 Method and device for producing a straight cylindrical body by molding using a loose hardenable granular material and the utilization thereof for producing a tube |
| 01/31/2002 | DE10036451A1 Verfahren und Vorrichtung zum Einbringen einer Beschichtung in Rohre Method and apparatus for introducing a coating in tubes |
| 01/24/2002 | US20020007783 Method and device for introducing a coating into pipes |
| 01/24/2002 | DE10130195A1 Anlage zum Aushärten von rohrförmigen Werkstücken aus Beton System for curing tubular workpieces made of concrete |
| 01/23/2002 | EP1174234A2 Method and apparatus for lining the inner wall of pipes |
| 01/22/2002 | US6340442 Method and apparatus for producing molded tubular objects from polymer concrete |
| 01/16/2002 | CN1077838C Reinforced concrete pipe with cross-section variable ends and its prefabricating tech |
| 01/03/2002 | US20020001514 Installation for hardening tubular concrete workpiece |
| 01/01/2002 | US6335065 Process for slip casting textured tubular structures |
| 12/26/2001 | CN2467303Y Ceramic lining composite steel pipe apparatus |
| 12/26/2001 | CN2467302Y Reinforced soft seepy blind pipe |
| 12/06/2001 | DE10027835A1 Verfahren und Vorrichtung zur Herstellung eines Muffenrohres aus einem verdichtungsfähigen Gemenge Method and apparatus for producing a socket pipe from a compactable mixture |
| 12/05/2001 | EP1160065A2 Method and apparatus for producing a socket pipe of a compactable material |
| 12/05/2001 | CN2463158Y Tile mould capable of exhausting |
| 11/28/2001 | EP0674573B1 A machine for vertical casting of pipes of concrete or a similar material in a mould system with a distributor wheel |
| 11/15/2001 | DE10022753A1 Vibrator for pipes produced in molds has ring-shaped body, with top and bottom belt as annular discs joined by arms |
| 11/14/2001 | CN2459155Y Core extractor for grouped vertical mould |
| 11/07/2001 | CN1321118A Installation for producing pipes by centrifugal casting |
| 10/31/2001 | CN1074109C Modular sleeve for protecting repairing or renovating a pipe |
| 10/31/2001 | CN1073915C Improved process for the production of cement slabs |
| 10/10/2001 | CN1316320A Technology for making prestressed pressure concrete pipe elbow |
| 09/26/2001 | EP1136213A2 Process and installation for automatic production of hollow bodies out of a mixture |
| 09/26/2001 | CN1071829C A drain material and process for producing the same |
| 09/19/2001 | CN1071179C Production of soft thermal insulating pipe shell |
| 09/13/2001 | WO2001066326A1 Exterior mold |
| 09/13/2001 | DE10010917A1 Mold mantle for casting concrete pipes is in sections to open and close the mantle with locks operated by a rod with settings to allow for relative movement during casting |
| 09/12/2001 | CN1312445A Prestressed concrete pressure pipe and its making process |
| 09/06/2001 | DE10013824C1 Automated manufacturing method for hollow concrete components has pre-assembled molding components separated at molding station dependent on molding requirements |
| 08/30/2001 | WO2001062457A1 A method and an apparatus for the manufacture of well equipment with permanently mounted ladder steps |
| 08/22/2001 | EP1125679A2 Apparatus for disposing of cut green body pieces of an insulator preform |
| 08/22/2001 | CN1309015A Process for preparing anticorrosion coating on pipeline |
| 08/15/2001 | CN2442820Y Turning mould device for prefabricated wall board |
| 08/15/2001 | CN2442819Y Well pipe mould |
| 08/15/2001 | CN2442818Y Ash stopping disc for well pipe mould |
| 07/19/2001 | WO2001051264A2 Method and device for producing a straight cylindrical body by molding using a loose hardenable granular material and the utilization thereof for producing a tube |
| 07/12/2001 | WO2001049633A1 Production of ceramic tubes with a radial orientation preference |
| 07/12/2001 | DE10000165A1 Verfahren und Vorrichtung zur Herstellung von Bauteilen und Halbzeugen aus synthetischem Graphit oder keramischem Granulat, insbesondere zur Herstellung von Graphitrohren Method and apparatus for production of components or semi-finished products of synthetic graphite or ceramic granulate, in particular for the manufacture of graphite tubes |
| 07/11/2001 | CN1068275C Method and device for producing moulded bodies from polymer concrete |
| 07/03/2001 | CA2043483C Process for producing tubular molded parts made of high-temperature superconductor material and also a plant for carrying it out |
| 06/13/2001 | CN1067002C Centrifugal molding method for compsite pipe having resin concrete layer and for resin concrete |
| 05/31/2001 | DE19955547A1 Vibrating device for shuttering boards with a rotating symmetrical section includes two half-systems with motors along a common axis rotating on bearings at a symmetrical point either by means of a diffused gearbox or freely opposed. |
| 05/09/2001 | CN1294045A Technology for equipment for machining rotary tube |
| 05/03/2001 | DE19951565A1 Method and appliance for placing elastic sealing rings onto profiled rings comprises expander, hoist, support and lowering and raising mechanism |
| 04/24/2001 | US6221813 Shaped bodies comprising textured superconducting material and a process for their production |
| 04/11/2001 | CN1064298C Improved process and equipment for lining concrete pipes |
| 03/14/2001 | CN1287048A Gradient ceramic-film tube and its preparation |
| 02/21/2001 | CN2420121Y Ceramic inner lining composite steel tube equipment |
| 02/21/2001 | CN2420120Y Concrete member moulding machine |
| 02/20/2001 | US6190595 For manufacturing bent workpieces, having an extrusion die which presses material through a bottom die, further bottom die elements are displaceably, rotatably disposed so their openings form extrusion duct of variable curvature and twist |
| 02/15/2001 | WO2001010616A1 Method and apparatus for producing concrete products |
| 02/14/2001 | EP1075916A2 Process and die for making closed-end ceramic tubes |
| 02/14/2001 | CN1283541A Method and mould for mfg. end-enclosed ceramic tube |
| 02/14/2001 | CN1062004C Thin sheet having inorganically filled substrate, its prepn and use |
| 02/10/2001 | CA2315860A1 Process and die for making closed-end ceramic tubes |
| 02/06/2001 | US6183557 Air bellow suspended pipe lining machine |
| 01/17/2001 | CN1280053A Deep motor-pumped well pipe of steel bar reinforced concrete |
| 01/16/2001 | CA2053558C Cage positioner |
| 01/10/2001 | CN2413887Y Continuous pouring machine for cement pipeline |
| 12/21/2000 | DE19927888A1 Press roller for the prodn of concrete pipes has profiled grooves at the outer mantle for reduced wear and lower energy consumption |
| 12/20/2000 | CN2411104Y Ceramic tile isostatic pressing mould |
| 12/20/2000 | CN1277096A Vacuum injection process of preparing electrolyte film tube and its forming equipment |