| Patents for B21C 37 - Manufacture of metal sheets, rods, wire, tubes, profilesor like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape (9,784) |
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| 08/07/1990 | US4945635 Method of manufacturing brazable pipes and heat exchanger |
| 08/02/1990 | CA2007577A1 Process and machine for the forming of metal tubes into conical or tapered bodies |
| 08/01/1990 | EP0380233A1 Method for producing a fabric covered metal blind rail |
| 07/31/1990 | US4944287 Flexible tube of endoscope |
| 07/31/1990 | CA1272015A1 Manufacture of roll formed and coated articles |
| 07/25/1990 | CN1008943B Finned heat transfer device and method for making same |
| 07/24/1990 | US4942751 Process and apparatus for forming internally enhanced tubing |
| 07/04/1990 | WO1990007392A1 Method for manufacturing of square pipes from coated steel strips |
| 07/04/1990 | CN1043453A Process and apparatus for producing spirally-seamed metal tubing |
| 07/04/1990 | CA2045127A1 Method for manufacturing of square pipes from coated strips |
| 07/03/1990 | US4938282 High performance heat transfer tube for heat exchanger |
| 06/27/1990 | EP0375039A1 Method for the manufacture of pipe from strip steel |
| 06/27/1990 | CN1008515B Apparatus for winding-up of cross-ribs |
| 06/26/1990 | US4936379 Condenser for use in a car cooling system |
| 06/19/1990 | US4934224 Strip threading tension monitoring system |
| 06/13/1990 | DE3841795A1 Method for the continuous production of longitudinally seam-welded tubes and an apparatus for carrying out the method |
| 05/31/1990 | WO1990005598A1 Method and device for making profiled pipes used for well construction |
| 05/31/1990 | DE3939217A1 Prodn. of profiled rod - using extruder followed by rolling stand with 2 sets of rolls at 90 deg. to each other and device to maintain constant min. tensile stress |
| 05/30/1990 | EP0370978A2 Constant wall shaft with reinforced tip |
| 05/30/1990 | EP0370635A2 Method and apparatus for manufacturing plastic-lined pipe |
| 05/29/1990 | US4928509 Method for manufacturing a pipe with projections |
| 05/29/1990 | US4928507 Methods and apparatus for manufacturing seamless tube |
| 05/23/1990 | DE3840599C1 Hose which is wound helically from a strip-like web of material, and process for the production thereof |
| 05/22/1990 | US4926667 Method of sizing and straightening extruded tubes |
| 05/22/1990 | CA2001609A1 Method and apparatus for manufacturing plastic-lined pipe |
| 05/22/1990 | CA1269282A1 Flexible tubular body manufacturing process, device used in said process, and flexible bodies thus made |
| 05/16/1990 | CN1042101A Production method for unequal thickness pipe of bicycle |
| 05/15/1990 | US4925741 Getter wire |
| 05/15/1990 | US4925539 Metal fibers obtained by bundled drawing |
| 05/15/1990 | US4924684 Apparatus for forming and cutting spiral pipe |
| 05/15/1990 | CA1268968A1 Automatic tab plate welding apparatus |
| 05/08/1990 | US4923108 Process for internally strengthening tubes |
| 05/03/1990 | DE3837044A1 Method of fabricating longitudinally seam-welded pipes |
| 05/01/1990 | US4921042 High performance heat transfer tube and method of making same |
| 04/25/1990 | CN1041641A Composite bar structures of interlocked multiple members and method of producing the same |
| 04/18/1990 | EP0363488A1 Cutting instrument for making a tubular element with transverse ribs for heat exchanger |
| 04/17/1990 | US4916989 Strip tensioning system for a strip peeling machine |
| 04/17/1990 | US4916853 Method for manufacturing welded pipes |
| 04/11/1990 | EP0362383A1 Method of making a tubular element with transverse ribs for heat exchanger |
| 04/11/1990 | CN1007496B Complex pipe, its mfr. method and heat pipe using the pipe |
| 04/10/1990 | US4915166 Having an integral helical fin of fin high density and a tube wall more highly strained hardened than the fin tip |
| 04/10/1990 | US4914810 Apparatus for measuring the pore size of enhanced tubes |
| 04/04/1990 | EP0360867A1 Method of working double tube |
| 04/04/1990 | CN2055416U Oblate spiral wind pipe working machine |
| 03/28/1990 | EP0360362A1 Condenser |
| 03/20/1990 | US4909032 Combustor of high pressure burner for rocket engine and method of fabrication thereof |
| 03/15/1990 | DE3922653A1 Verfahren zum herstellen duennwandiger metallrohre Method for the manufacture of thin-walled metal tubes |
| 03/14/1990 | CN1040424A Crack arrester for high-pressure welded pipelines and method of producing same |
| 03/07/1990 | CN1040258A Connecting method of composite pipe |
| 03/06/1990 | US4906609 Fabrication of superconducting oxide wires by powder-in-tube method |
| 03/06/1990 | US4905885 Method and apparatus for forming and welding thin-wall tubing |
| 02/27/1990 | CA1266306A1 High-strength conductors and process for manufacturing same |
| 02/22/1990 | WO1990001671A1 Crack growth limiter in high-pressure welded pipelines and method of making it |
| 02/21/1990 | CN1039752A Apparatus for forming plastics coated tube |
| 02/20/1990 | US4901553 Method of manufacturing a finned tube |
| 02/20/1990 | US4901550 Manufacturing method of extra fine wire |
| 02/20/1990 | US4901416 Control system for manufacturing enhanced tubes |
| 02/20/1990 | US4901415 Method for connecting composite pipes |
| 02/07/1990 | EP0353977A2 Apparatus for forming plastics coated tube |
| 02/07/1990 | EP0353795A1 Method for making a self-supporting flexible hose, devices for effecting this method and self-supporting flexible hose |
| 02/07/1990 | EP0353622A1 Apparatus for forming perforated tubes |
| 01/31/1990 | CN2051876U Automatic welding and extruding roller with voltage-stabilizing device |
| 01/31/1990 | CN1039196A Method for making self-supporting flexible hose, devices for effecting this method and self-supporting flexible hose |
| 01/30/1990 | US4896818 Method of fabricating light-weight sections |
| 01/24/1990 | EP0351938A2 An aluminum heat exchanger |
| 01/23/1990 | US4895011 Continuously balanced apparatus for storing and dispensing elongate materials |
| 01/17/1990 | EP0351044A2 Production of brazeable pipes |
| 01/17/1990 | EP0350927A2 Composite bar structures of interlocked multiple members and method of producing the same |
| 01/17/1990 | EP0350882A2 Device for manufacturing conical poles |
| 01/16/1990 | US4893972 Cutting tool |
| 01/11/1990 | DE3821787A1 Method and apparatus for fabricating a pipe bend |
| 12/27/1989 | EP0347476A1 Seaffold plank |
| 12/21/1989 | DE3820152A1 Multilayered corrugated pipe, in particular for lining chimneys |
| 12/12/1989 | US4886202 Method of making metal matrix monotape ribbon and composite components of irregular shape |
| 12/05/1989 | US4884426 Device for spiral winding of tapes |
| 11/30/1989 | WO1989011351A1 Improvements in helically formed tubing |
| 11/29/1989 | EP0343973A1 Improvenments in helically formed tubing |
| 11/23/1989 | EP0342642A1 Fabrication method of a work piece from a long blank or an intermediate product |
| 11/23/1989 | DE3913906A1 Herstellungsverfahren fuer rippenrohre mit hohem waermeaustauschkoeffizienten Manufacturing process for finned tubes with high waermeaustauschkoeffizienten |
| 11/15/1989 | CN1037201A The copper-clad-steel bimetallic tube and the preparation method thereof |
| 11/07/1989 | CA1262616A1 Apparatus for cutting hollow pipes |
| 11/02/1989 | EP0339552A1 Method of manufacturing a heat exchanger |
| 11/02/1989 | EP0339094A1 Method of guiding material to fin-pass roll and its guide roll stand. |
| 10/31/1989 | US4876869 Inner grooving process for a metallic tube |
| 10/24/1989 | US4875353 Method and apparatus for manufacturing curved pipe |
| 10/18/1989 | EP0337708A2 Improvements in or relating to integral finned tubes and a method of manufacturing same |
| 10/18/1989 | EP0337517A1 Metal fibers obtained by bundled drawing |
| 10/18/1989 | CN2046044U Tool mounted with spiral rib of inner metal pipe |
| 10/11/1989 | EP0336783A2 Producing a thread on a tube |
| 10/11/1989 | EP0335969A1 Apparatus for making helically wound interlocked flexible pipe |
| 10/10/1989 | US4873047 Wetting with phosphoric acid before rolling to desired shapes, then drying |
| 10/05/1989 | WO1989009111A1 Method of making a tubular element with transverse ribs for heat exchanger |
| 10/05/1989 | WO1989009107A1 Cutting instrument for making a tubular element with transverse ribs for heat exchanger |
| 09/27/1989 | EP0334295A2 Method and apparatus for shaping tubular bodies |
| 09/26/1989 | CA1260414A1 Integral joint forming of work-hardenable high alloy tubing |
| 09/19/1989 | US4866830 Method of making a high performance, uniform fin heat transfer tube |
| 09/12/1989 | US4865243 Sizing tool for a machine for the longitudinal seam welding of rounded can bodies |
| 09/12/1989 | US4864712 Method for producing a fabric covered metal rail |
| 09/06/1989 | EP0331613A2 Method and apparatus for producing a corrugated tube |
| 09/05/1989 | US4863091 Method and apparatus for producing continuous lengths of coilable tubing |