| Patents for B28B 21 - Methods or machines specially adapted for the production of tubular articles (3,281) |
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| 10/13/2004 | CN1535803A Concrete pipe manufacturing equipment and method |
| 10/07/2004 | US20040195725 Concrete pipe manufacturing machinery and methods |
| 10/06/2004 | CN2645886Y Multifunctional prefabricated pipe chase rotary molding machine |
| 10/06/2004 | CN1169660C Tool for shaping hollow tube |
| 10/06/2004 | CN1169659C Hollow tube for reinforced concrete, its mfg. method and special mould |
| 09/30/2004 | US20040187436 Forming elements from concrete pipe |
| 09/30/2004 | CA2464231A1 Device and method for producing multilayer concrete pipes |
| 09/30/2004 | CA2462655A1 Device and method for producing multilayer concrete pipes |
| 09/10/2004 | WO2004062867B1 A method and an apparatus for the manufacture of concrete pipes |
| 09/08/2004 | CN1526531A Rotary apparatus and method for winding protective GRP layer to make heavy concrete pipe pile |
| 09/02/2004 | DE10314722B3 Concrete pipe former has a stand with a rotating disc and a press head on the stand which forms a sealed machine |
| 09/01/2004 | CN2637148Y Die rolling ring |
| 08/25/2004 | CN1522840A Method for manufacturing thin-wall pipe for cast-in-situ concrete hollow core floor slab and special apparatus therefor |
| 08/18/2004 | CN1162261C Process for preparing isolating water agent of concrete |
| 08/11/2004 | EP1261465B1 Exterior mold |
| 07/29/2004 | WO2004062867A1 A method and an apparatus for the manufacture of concrete pipes |
| 06/30/2004 | EP1433581A1 Building structure, method and device for producing said building structure |
| 06/29/2004 | US6754941 Apparatus for pulling a molding ring off a neck of a concrete tubular workpiece |
| 06/15/2004 | US6748636 Method and apparatus for removing forming elements from concrete pipe |
| 06/03/2004 | WO2004045819A1 Moulding of concrete articles |
| 06/03/2004 | CA2506474A1 Moulding of concrete articles |
| 06/02/2004 | CN1151914C Technology for making thin-wall tube with reinforcing ribs for reinforced concrete |
| 05/19/2004 | CN2616351Y Prestressed tubular pile end board |
| 05/18/2004 | US6736365 Valve for use in producing cast concrete articles |
| 04/22/2004 | US20040075185 Method and device for producing a straight cylindrical body by molding using aloose hardenable granular matterial and the utilization thereof for producing a tube |
| 04/21/2004 | EP0855951B1 A collapsible core |
| 04/14/2004 | EP1018478B1 Paper feed roller |
| 04/14/2004 | CN2611469Y Light weight hollow partition wall plate |
| 04/08/2004 | DE10241238A1 Formeinsatz für Formmaschinen Mold insert for molding machines |
| 03/24/2004 | CN1483562A Technology for producing reinforced concrete drain-pipe |
| 03/24/2004 | CN1483561A Method for preparing thin wall ceramic pipe and centrifugal formation machine |
| 03/24/2004 | CN1483560A Technology for producing ceramic sand fltering pipe |
| 03/18/2004 | WO2004022294A2 Moulding insert for moulding machines |
| 03/17/2004 | CN1142377C Prestressed concrete pressure pipe and its making process |
| 03/10/2004 | CN1141208C Technology for making prestressed pressure concrete pipe elbow |
| 03/02/2004 | WO2004020165A1 Method and apparatus for fabricating a hollow-core concrete product |
| 03/02/2004 | CA2455837A1 Method and apparatus for fabricating a hollow-core concrete product |
| 02/24/2004 | US6695940 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 |
| 02/04/2004 | EP1385679A2 Method of assembling a ceramic body |
| 01/14/2004 | CN2598731Y Thin wall cement pipe automatic forming die |
| 01/14/2004 | CN2598730Y Thin wall cement pipe automatic forming device |
| 01/14/2004 | CN2598729Y Automatic forming equipment for processing thin wall cement pipe |
| 01/14/2004 | CN2598728Y Thin wall cement pipe automatic shaping moving filling device |
| 01/07/2004 | EP1212178B1 Method and apparatus for producing concrete products |
| 01/06/2004 | US6672857 Device for introducing a coating into pipes |
| 12/31/2003 | CN1463841A Two stage non-binding prestressed pressure tube and method for making same |
| 12/24/2003 | CN1462680A Tool for shaping hollow tube |
| 12/24/2003 | CN1462679A Tool for shaping hollow tube with ribs being reinforced |
| 12/24/2003 | CN1462678A Method of making hollow tube for reinforced concrete |
| 12/24/2003 | CN1462677A Method for making hollow reinforced tube |
| 12/18/2003 | US20030232104 Concrete mold and product made therefrom |
| 12/04/2003 | US20030222368 Flexible lightweight concrete form |
| 11/12/2003 | CN1454765A Hollow ceramic rod and manufacturing process thereof, and its application for producing light refractory material |
| 11/06/2003 | WO2003090988A1 Vertical moulding of concrete |
| 11/06/2003 | US20030205833 Method and facility for the automatic production of hollow bodies from mixed material |
| 11/06/2003 | CA2483452A1 Vertical moulding of concrete |
| 10/29/2003 | CN2582837Y Hollow pipe rib reinforced shaping mould apparatus |
| 10/23/2003 | WO2003086723A1 Method for manufacturing a shaft bottom part with lateral exits |
| 10/15/2003 | CN1448255A Construction method of in-situ concrete prestressed round pipe |
| 10/09/2003 | US20030190384 Concrete rollerhead assembly |
| 10/08/2003 | CN2578078Y Automatic bumper of cement pipe |
| 10/08/2003 | CN2578077Y Cold isostatic mould for ceramic tubular casing |
| 10/08/2003 | CN1446677A Method and appts. for mfg. pole |
| 10/02/2003 | WO2003080941A1 Molded concrete foundation element and method for its manufacture |
| 10/02/2003 | WO2003080303A1 Method and apparatus of manufacturing electric pole |
| 10/01/2003 | CN1445066A Method and special equipment for manufacturing thin-wall pipe applicable to cast-in-situ concrete hollow floor |
| 10/01/2003 | CN1122772C Process for preparing anticorrosion coating on pipeline |
| 09/24/2003 | CN1443634A Technological process for producing pipe pile by using fine-ground metallurgical slag and fine-ground high silicon sand multiple infiltration method |
| 09/24/2003 | CN1443633A Composite silicon sand portland cement and its application method in production of pipe pile |
| 09/24/2003 | CN1121927C Manufacture of core pipe for in situ deposited hollow floor board |
| 09/18/2003 | US20030173699 Hole forming plug |
| 09/17/2003 | CN1442278A Technological method of producing pretensioning prostressed concrete pipe pole using silica sand portland cement |
| 09/14/2003 | CA2376531A1 Hole forming plug |
| 09/04/2003 | WO2003072327A1 Method for producing a manhole element, particularly a manhole ring, upper sleeve for producing a manhole element, and a manhole element |
| 09/04/2003 | US20030164438 Exterior mold |
| 08/28/2003 | US20030159263 Method and apparatus for removing forming elements from concrete pipe |
| 08/20/2003 | CN1436748A High-strength composite material skeleton for green house and its forming process |
| 08/20/2003 | CN1436747A High-strength durable composite material and its production and application |
| 07/30/2003 | EP1331424A2 Ball valve for use in producing cast concrete articles |
| 07/23/2003 | CN1431088A Mfg. method of automatic molding cement tube with thin wall |
| 07/16/2003 | CN1114522C Vacuum injection process of preparing electrolyte film tube and forming device |
| 06/25/2003 | CN1425865A Specific ceramic lining composite pipe, pipe fitting and their producing method |
| 06/18/2003 | CN1424526A Water supplying and draining pipes and production thereof |
| 06/12/2003 | US20030107141 Method and an apparatus for the manufacture of well equipment with permanently mounted ladder steps |
| 06/10/2003 | US6575724 Apparatus for the production of ring-shaped bodies from concrete |
| 06/04/2003 | CN1110404C Manufacturing method of large diameter steel reinforced concrete composite pipeline |
| 05/21/2003 | CN1108906C Gradient ceramic-film tube and its preparation method |
| 05/08/2003 | US20030085490 containing silica powder produced by melting raw material silica powder in flame; perfectly spherical; also contains alumina powder; average grain diameter of silica powder is 2 7 mu m; for silicon wafers |
| 05/07/2003 | EP1308263A2 Highly inorganically filled compositions |
| 05/07/2003 | EP1308254A1 Method and apparatus for the production of concrete pipes |
| 05/06/2003 | US6558597 Process for making closed-end ceramic tubes |
| 04/30/2003 | CN1107015C Paper feed robler and its making method |
| 04/23/2003 | CN1411968A Chemical prestress process for making steep pipe centrifugal concrete product |
| 04/16/2003 | CN1410241A Prestressed reinforced concrete well wall pipe and its manufacturing method |
| 03/26/2003 | CN2541157Y Rib reinforced hollow tube shaping tool |
| 03/19/2003 | CN2540268Y Expansible core loose die |
| 03/13/2003 | WO2003020482A1 Building structure, method and device for producing said building structure |
| 02/26/2003 | CN2537536Y Hollow pipe forming tool |
| 02/26/2003 | CN1398706A Crack controlling method for concrete tube section |
| 02/26/2003 | CN1102091C Deep motor-pumped well pipe of steel bar reinforced concrete |