| Patents for B28B 21 - Methods or machines specially adapted for the production of tubular articles (3,281) |
|---|
| 02/06/1980 | EP0007358A1 Method of moulding concrete |
| 01/22/1980 | US4184520 Manually formable stirrup mat reinforcement and pipe reinforcing method based thereon |
| 01/22/1980 | CA1070136A1 Building element |
| 01/15/1980 | US4183724 Conduit making apparatus |
| 01/01/1980 | US4181484 Device for forming underground pipelines |
| 12/11/1979 | US4178338 Method of casting thin-walled, hollow concrete posts |
| 10/16/1979 | CA1064229A1 Anti-torque fabric for pipe reinforcing gage |
| 08/28/1979 | CA1061070A1 Formation of products from temporarily plastic materials |
| 08/07/1979 | US4163640 Apparatus for extruding a honeycomb structural body |
| 07/31/1979 | US4162771 Rod tensioner |
| 07/24/1979 | CA1058840A1 Clay centering device for a potter's wheel |
| 06/26/1979 | US4159361 Cold formable, reinforced panel structures and methods for producing them |
| 06/12/1979 | CA1056178A1 Reinforced panel structures and methods for producing them |
| 05/29/1979 | CA1055230A1 Machine for making concrete pipes in upright position |
| 05/22/1979 | CA1054781A1 Mould for making tapered concrete poles |
| 05/08/1979 | US4153232 Apparatus for actuating inner and outer forms of a concrete pipe forming mold |
| 04/24/1979 | US4151246 Manufacture of short pipes |
| 04/05/1979 | WO1979000167A1 Method of moulding concrete |
| 03/27/1979 | CA1051173A1 Pile extruder |
| 02/06/1979 | CA1047743A1 Method and apparatus for forming refractory tubing |
| 01/16/1979 | US4134568 Plural molds with common actuating means |
| 01/16/1979 | US4134567 Apparatus for forming fans |
| 01/16/1979 | CA1046244A1 Apparatus for tensioning reinforcements in the process of manufacturing concrete poles and the like |
| 12/26/1978 | US4131408 Machine for making dry cast concrete pipe |
| 11/07/1978 | CA1041740A1 Apparatus for automatically adjusting center-height of a mold |
| 10/31/1978 | US4123033 Apparatus for forming hollow cylindrical pipes of reinforced concrete |
| 10/24/1978 | CA1040844A1 Method and apparatus for forming steps in manholes and the like |
| 10/10/1978 | CA1039930A1 Apparatus and method for manufacturing branched earthware pipe fittings |
| 10/03/1978 | US4118165 Packerhead pipe making machine |
| 09/12/1978 | US4113823 Centrifugal technique |
| 08/29/1978 | US4109635 Machine grooved joint on hollow concrete cylinders |
| 08/15/1978 | US4106300 Method of making reinforced cast-in-place concrete pipe |
| 07/25/1978 | US4102972 Refractory pipe fittings and production thereof |
| 07/18/1978 | US4101622 Method of casting beveled pipe |
| 04/18/1978 | US4084828 Bell-and-spigot concrete pipe joint with plastic liner ring |
| 04/18/1978 | US4084782 Split mould for making tapered concrete poles |
| 04/04/1978 | US4082120 Method of producing tubular lattice reinforcement for reinforced concrete tubular pipe having a socket at one end thereof |
| 03/21/1978 | US4080135 Apparatus for formation of products from temporarily plastic materials |
| 03/21/1978 | US4079500 Method of making reinforced concrete pipe |
| 03/07/1978 | US4077577 Non-stressed, high strength, cement-containing pipe and its production |
| 02/21/1978 | US4075272 Ladder rung implanter |
| 01/10/1978 | US4067679 Machine for making concrete pipes in upright position |
| 12/27/1977 | US4065533 Process for the continuous production of silicon rods or tubes by gaseous deposition into a flexible wound band |
| 11/15/1977 | US4058428 Pipe coating machine |
| 10/11/1977 | US4053134 Pipe mold having insert support means |
| 10/11/1977 | US4052916 Process for making a die punch |
| 09/20/1977 | US4049022 Concrete pipes |
| 09/13/1977 | US4047693 Supporting ring for use in the casting of concrete pipes |
| 08/30/1977 | US4045533 Molding portland cement and an expansion component selected from calcium sulfate, oxide, and aluminate; curing |
| 08/23/1977 | US4044088 Stressed hollow concrete cylinders |
| 08/23/1977 | US4043723 Conduit molding machine |
| 08/16/1977 | US4042315 Apparatus for making concrete pipe |
| 08/09/1977 | US4041195 Compression |
| 08/09/1977 | US4041118 Vibration treatment of wire reinforced concrete pipe |
| 08/02/1977 | US4039642 Method of making concrete pipe |
| 08/02/1977 | US4039608 Method and means for creating perforated concrete casing |
| 05/17/1977 | US4024006 Urethane |
| 05/17/1977 | US4023771 Means for engaging, lifting and transporting concrete pipe molds |
| 04/19/1977 | US4018251 Machine for making reinforcing baskets for steel concrete posts, masts, pipes and the like |
| 01/18/1977 | US4003545 Core means having a rubber liner |
| 11/30/1976 | US3994651 Apparatus for removing waste portions from hollow moulded articles |
| 11/02/1976 | US3989431 Pile extruder |
| 11/02/1976 | US3989221 Form structure for use in the making of columnar or the like concrete products |
| 11/02/1976 | US3989177 Ladder rung implanter |
| 11/02/1976 | US3989144 Apparatus for transferring a mold |
| 10/19/1976 | US3986822 Boron nitride crucible |
| 09/28/1976 | US3982565 Prestressed concrete pipe |
| 08/17/1976 | US3974615 Apparatus for forming steps in manholes and the like |
| 08/10/1976 | US3973749 Hollow formwork elements for producing concrete structures |
| 07/13/1976 | USRE28902 Vibratory core for concrete pipe making machine |
| 06/22/1976 | US3964522 Bevel pipe winder |
| 06/22/1976 | US3964521 Bevel pipe winding method and product |
| 06/08/1976 | US3962391 Disc support structure and method of producing the same |
| 05/18/1976 | US3957409 Means for creating perforated concrete casing |
| 04/20/1976 | US3951578 Apparatus for automatically adjusting center-height of a mold and the like used for manufacturing concrete pipes |
| 04/13/1976 | US3950465 Centrifugal casting, glass fibers |
| 03/23/1976 | US3945787 Cap rest assembly for packerhead/vibration system concrete pipe machine |
| 03/23/1976 | US3945782 Concrete pipes |
| 03/09/1976 | US3942936 Facing ring and pouring chute for vertically cast concrete pipe |
| 03/02/1976 | US3941347 Composite concrete and steel pallet for forming one end of concrete pipe |
| 02/17/1976 | US3938685 Means for engaging, lifting and transporting concrete pipe molds |