| Patents for B28B 21 - Methods or machines specially adapted for the production of tubular articles (3,281) |
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| 07/17/1984 | US4460529 Flame spraying |
| 07/05/1984 | WO1984002493A2 Plant for the continuous and automated manufacturing of agglomerated, sintered, vulcanized and pressed articles |
| 06/26/1984 | CA1169789A1 Pipes |
| 06/19/1984 | CA1169236A1 Method of making a building panel |
| 06/12/1984 | US4454172 Lining metal tubing with a corrosion- and abrasion-proof cement mortar |
| 05/29/1984 | US4451418 Method for forming a green body of ceramic arc tubes used for a metal vapor discharge lamp and a molding die for forming said tube |
| 05/29/1984 | US4451222 Apparatus for producing concrete pipes |
| 05/22/1984 | US4449912 Apparatus for the automatic ejection of concrete pipes |
| 05/09/1984 | EP0107747A1 Method of making cylindrical ceramic tubes with localized impressions, and apparatus for carrying out this method |
| 05/08/1984 | CA1166812A1 Isostatic compression moulding device |
| 05/01/1984 | US4445715 Insulated joint and method for producing same |
| 03/27/1984 | US4439131 Apparatus for producing concrete elements of high dimensional accuracy |
| 03/20/1984 | US4437495 Pipes and pipe coatings |
| 03/14/1984 | EP0102932A2 Concrete pipe and method for the production thereof |
| 02/22/1984 | EP0100968A1 Method of producing a tubular helical enclosure, apparatus for production by this method, and its applications |
| 01/31/1984 | US4428522 Step driver |
| 01/24/1984 | CA1160819A1 Process and device for removing from their molds prestressed concrete elements molded on a long bed |
| 01/17/1984 | CA1160579A1 Binderless ceramic or ceramic oxide hollow body and method for its manufacture |
| 01/11/1984 | EP0098119A1 A method for producing a thin-walled ceramic tube |
| 01/11/1984 | EP0097750A2 Method and apparatus for forming impressions on ceramic tubes |
| 01/03/1984 | CA1159671A1 Method and apparatus for making reinforced concrete products |
| 12/06/1983 | US4418885 Nozzle hood for moulding pipes |
| 11/01/1983 | US4412561 Glass fiber-reinforced cement non-plate articles |
| 10/18/1983 | US4410479 Method of making a molded-joint assembly |
| 10/04/1983 | US4407648 Counter rotating packerhead assembly |
| 10/04/1983 | US4407106 Complex column |
| 09/28/1983 | EP0089420A1 Method, apparatus and mould for manufacturing concrete tubes |
| 09/27/1983 | US4406605 Apparatus for forming concrete pipe of uniform density including control means to vary feed rate of concrete/aggregate as function of packerhead torque |
| 09/20/1983 | US4404786 Method and apparatus for making reinforced concrete products |
| 08/23/1983 | US4400149 Concrete pipe making machine with redensification apparatus |
| 07/21/1983 | WO1983002422A1 Method and aggregate for moulding concrete hollow elements |
| 07/13/1983 | EP0029430B1 Moulding of construction products |
| 07/06/1983 | EP0083145A1 Method of manufacturing concrete-based products using composite inorganic and organic substances |
| 06/21/1983 | US4389360 Method of forming a protective coating on a long lance to be immersed in molten metal |
| 06/07/1983 | CA1147757A1 Process for the production of colloidal mortar and product according to this process |
| 05/24/1983 | US4384840 Apparatus for molding tubular parts by isostatic compression |
| 03/29/1983 | US4378032 Slotted concrete pipe |
| 02/23/1983 | EP0072506A1 Hollow construction unit for fluids in the building field, particularly a chimney construction unit, as well as a method of and a device for manufacturing the same |
| 02/16/1983 | EP0072190A2 A method for forming a green body for a ceramic arc tube used for a metal vapor discharge lamp and a molding die for forming said green body |
| 12/28/1982 | US4365781 Method and apparatus for casting tubular bodies |
| 12/21/1982 | US4364891 Slotted concrete pipe |
| 11/23/1982 | US4360331 Apparatus for molding a concrete pipe |
| 10/12/1982 | CA1133525A1 Fabrication of rotary heat exchangers made of magnesium aluminum silicate glass-ceramic |
| 08/03/1982 | US4342713 Process and device for production of concrete pipe by filling and compaction of fresh concrete in an upright form |
| 07/20/1982 | US4340553 With counter rotating packerhead assembly |
| 07/08/1982 | WO1982002166A1 Method and apparatus for placing concrete |
| 06/22/1982 | US4336013 Apparatus for forming concrete articles of uniform density |
| 06/22/1982 | CA1125999A1 Packerhead and core control system |
| 06/15/1982 | US4335169 Slotted concrete pipe |
| 06/15/1982 | US4334848 Apparatus for centrifugal molding of concrete pipe |
| 06/08/1982 | CA1124995A1 Cement lining of pipes |
| 05/18/1982 | US4330243 Apparatus for moulding concrete elements |
| 04/28/1982 | EP0050114A1 Moulding of articles. |
| 04/20/1982 | CA1121993A1 Method of casting concrete |
| 03/16/1982 | CA1119976A1 Pipe section, preferably a concrete pipe section |
| 03/09/1982 | CA1119391A1 Process for the manufacture of gate valves for closure devices having a pouring nozzle and similar objects |
| 02/23/1982 | CA1118584A1 Machine for moulding of pipe-type elements, especially of steel fabric reinforced concrete pipes |
| 02/09/1982 | US4314957 Method for manufacture of polymer-impregnated hollow concrete product |
| 01/19/1982 | US4311632 Process for molding a concrete pipe |
| 01/05/1982 | CA1115504A2 Pallet positioner |
| 01/05/1982 | CA1115503A1 Method and apparatus for moulding hydraulic cement or the like material |
| 01/05/1982 | CA1115502A1 Apparatus and method for simultaneously making a plurality of concrete pipes |
| 01/05/1982 | CA1115501A2 Bell packer |
| 01/05/1982 | CA1115500A1 Method and apparatus for manufacturing articles of hydraulic substances |
| 12/22/1981 | CA1114587A1 Process and apparatus for manufacturing single piece railroad ties of prestressed concrete |
| 12/15/1981 | US4305564 Casting mould for the production of concrete or similar pipes in an upright position |
| 11/03/1981 | CA1111625A1 Supporting ring for use in the casting of concrete pipes |
| 10/21/1981 | EP0038010A1 Apparatus for moulding tubular parts by isostatic compression |
| 10/20/1981 | US4295501 Spacer bar and related method for concrete pipe manufacture |
| 09/08/1981 | US4288104 Pipe section, preferably a concrete pipe section |
| 07/23/1981 | WO1981001979A1 Moulding of articles |
| 06/30/1981 | CA1103905A1 Cocrete pipe making machine with redensification apparatus |
| 06/03/1981 | EP0029430A1 Moulding of construction products. |
| 05/05/1981 | US4265961 Building device |
| 03/17/1981 | US4256686 Having a closed end and uniform strength by extrusion |
| 03/03/1981 | US4253814 Packerhead and core control system |
| 02/24/1981 | US4252763 Method and apparatus for cement lining of pipes |
| 02/24/1981 | CA1096146A1 Method of installing manhole safety steps and plugs therefor |
| 02/10/1981 | US4249871 Plant for producing reinforced-concrete pipes |
| 02/03/1981 | US4248580 Structure for directing concrete to pipe jacket |
| 02/03/1981 | CA1094784A1 Form assembly |
| 01/27/1981 | US4247516 Method of making prestressed concrete poles, tubes, and support columns |
| 01/20/1981 | CA1093795A1 Stressed hollow cylinders |
| 01/07/1981 | EP0021905A1 Method and device for stripping prestressed concrete products moulded on a long bed |
| 12/30/1980 | US4241543 Method of installing manhole safety steps and plugs therefor |
| 11/26/1980 | EP0019473A1 Method for manufacture of polymer-impregnated hollow concrete product |
| 11/25/1980 | US4235831 Conduit making method |
| 11/25/1980 | US4235617 Fabrication of rotary heat exchangers made of magnesium aluminum silicate glass-ceramic |
| 10/21/1980 | US4228826 Interlocking, laminated refractory for covering a pipe |
| 10/07/1980 | US4226568 Pallet Positioner |
| 09/18/1980 | WO1980001888A1 Moulding of construction products |
| 09/17/1980 | EP0015469A1 Apparatus for pressing a concrete pipe in an underlying socket by centrifugal force |
| 08/12/1980 | US4217080 Machine for molding pipe-type elements such as steel fabric reinforced concrete pipes |
| 08/12/1980 | CA1083331A1 Apparatus for molding concrete articles and the like |
| 06/25/1980 | EP0012675A1 Apparatus for moulding concrete bodies |
| 06/10/1980 | CA1079034A2 Apparatus for the manufacture of prefabricated building components of expanded material and cement |
| 04/15/1980 | US4197623 Factory barge for manufacturing reinforced elongated concrete products |
| 04/08/1980 | US4197074 Bell packer for a pair of pallets |
| 03/18/1980 | CA1073659A1 Boron nitride crucible |
| 03/04/1980 | CA1072894A1 Manually formable stirrup mat reinforcement and pipe reinforcing method based thereon |