| 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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| 05/23/1991 | DE3938388A1 Mfg. U=shaped tube elbows for heat exchanger - forms solder venting ducts by milling cutters, with tube still straight |
| 05/21/1991 | US5016806 Tube weld mill |
| 05/21/1991 | US5016460 Durable method for producing finned tubing |
| 05/21/1991 | US5016459 Method and guide roll stand for guiding and shaping strip material in a pipe mill |
| 05/16/1991 | WO1991006499A1 Improved roller |
| 05/14/1991 | US5014760 Steel wire for reinforcing elastomer articles with improved adhesion promoting layer |
| 05/14/1991 | US5014424 Method of making a curved pipe |
| 04/30/1991 | US5011064 Method of manufacturing a double-walled tube |
| 04/30/1991 | US5010643 High performance heat transfer tube for heat exchanger |
| 04/18/1991 | DE3933389A1 Fully automated mfr. of tubes with helical seams - involves independently adjustable bending tools and guide rollers with central computer allowing for strip width tolerances |
| 04/17/1991 | CN1050692A Method for making thin-wall, square zr-alloy pipe |
| 04/09/1991 | US5005755 Flexible tube of endoscope and method of and apparatus for producing the same |
| 04/09/1991 | US5005395 Method of manufacturing electric welded pipes under hot conditions |
| 04/09/1991 | CA1282646C Apparatus for crimping pipe |
| 04/03/1991 | EP0419494A1 Apparatus for the continuous production of small-diameter welded pipes |
| 04/02/1991 | US5004143 Method of manufacturing clad bar |
| 04/02/1991 | US5003690 Finning and thread rolling machine |
| 03/27/1991 | CN1012209B Connecting method of composite pipe |
| 03/26/1991 | US5001825 Catheter guidewire fabrication method |
| 03/26/1991 | US5001819 Apparatus for forming perforated tubes |
| 03/21/1991 | DE3927989A1 Lined, bent pipe sections - obtd. by inserting straight tube into another straight tube and bending in at least one place on mechanical pipe bender |
| 03/20/1991 | EP0417300A1 Hollow worm conveyer made of strip material and method for making it |
| 03/20/1991 | CN1049986A Method of manufacturing specialpipe for drilling and apparatus therefor |
| 03/19/1991 | US5000369 Method and apparatus for manufacturing plastic-lined pipe |
| 03/19/1991 | US4999903 Process of manufacturing composite tube by rolling and welding without elongating the same |
| 03/19/1991 | US4999901 Method of producing a nozzle member for sucking or transporting a string of yarn |
| 03/07/1991 | DE3929022A1 Hydraulic cylinder tube mfr. process - involves using mandrel bar and braking ring |
| 03/06/1991 | CN2072450U Screw-thread steel cold-draw rolled device |
| 02/26/1991 | US4995549 Method and apparatus for forming and welding thin-wall tubing |
| 02/26/1991 | US4995252 Method and apparatus for internally enhancing heat exchanger tubing |
| 02/12/1991 | CA1280106C Method of manufacture of manifolds and manifold provided by such method |
| 02/07/1991 | WO1991001195A1 Device for making tubular element of rectangular cross-section with transverse ribs for heat exchanger |
| 02/07/1991 | WO1991001187A1 Method and apparatus for forming a duct section |
| 02/05/1991 | US4989433 Method and means for metal sizing employing thermal expansion and contraction |
| 01/29/1991 | US4987759 Machine for manufacturing helically-seaming tubing |
| 01/16/1991 | EP0408538A2 Method of producing tubes from a metal strip |
| 01/10/1991 | DE3920600A1 Double walled pipe with insulating layer - is used as vehicle exhaust pipe and has pin for bending it into shape |
| 01/09/1991 | CN1048340A Process of glazing a layer of plastic on inner wall of metal pipes |
| 01/08/1991 | CA1278776C Production of a taper rod |
| 01/02/1991 | EP0405065A2 Method of producing rectangular hollow sections of steel with differential wall thickness |
| 12/26/1990 | CN2068024U Multi-roller level-adjusting finning-pressing machine |
| 12/26/1990 | CN1047991A Process and apparatus for producing helically-seamed pipe |
| 12/19/1990 | EP0403425A1 Method and apparatus for cutting tubes |
| 12/19/1990 | EP0403037A1 Compression fitting |
| 12/19/1990 | CN1047914A Bent pipe |
| 12/13/1990 | WO1990014902A1 Method of making a tubular element with transverse ribs for a heat exchanger |
| 12/11/1990 | CA1277655C Manifold and method of manufacturing the same |
| 12/05/1990 | EP0400576A1 Bent pipe |
| 11/28/1990 | EP0399969A1 Packaging tube and its method of manufacture |
| 11/28/1990 | CN1047246A Method for manufacturing molding material containing metal fibres and apparatus therefor |
| 11/28/1990 | CN1010556B Method for shaping anodic aluminium oxide sheet |
| 11/22/1990 | EP0398383A2 Method of manufacturing molding material containing metal fibers and apparatus therefor |
| 11/22/1990 | EP0397876A1 Method and device for making profiled pipes used for well construction |
| 11/22/1990 | EP0397656A1 Process and device for manufacturing tubes with helically arranged seams. |
| 11/22/1990 | DE3916225A1 Forming grooves in bore of heat exchange tube - involves tool with convex longitudinal profile with oblique grooves |
| 11/20/1990 | US4971240 Method and apparatus for forming heat exchanger tubes |
| 11/20/1990 | US4971239 Method and apparatus for making welded tapered tubes |
| 11/20/1990 | US4970770 Method of making a coated heat exchanger with tubes and fins |
| 11/20/1990 | CA1276437C Method and apparatus for manufacturing hollow tubular members |
| 11/19/1990 | CA2016975A1 Method of manufacturing molding material containing metal fibres and apparatus therefor |
| 11/13/1990 | US4969255 Apparatus for producing heat exchanger tubes |
| 11/06/1990 | US4967473 Method of forming a bow beam for a truck trailer |
| 11/06/1990 | US4967462 Method of manufacturing an integrated light-weight solid metal shaft and an integrated light-weight metal pipe shaft for use in a business machine, and the integrated light-weight solid metal shaft and a similar pipe shaft manufactured by the same method |
| 11/06/1990 | CA1275970C Cold drawing technique and apparatus for forming internally grooved tubes |
| 11/06/1990 | CA1275788C Method for providing a tubular node in a frame work truss structure such as offshore platforms for oil drilling and production |
| 10/31/1990 | EP0395626A1 Preformed part for manufacture of tubular parts with longitudinal seam and tube made therefrom |
| 10/31/1990 | EP0395603A2 A tapered wall shaft with reinforced tip and method for its manufacture |
| 10/31/1990 | CN1010186B Device for guiding and turning die for manufacture of metal foils |
| 10/31/1990 | CN1010184B Method of indroducing stuff into finishing roll and guide supports therefor |
| 10/29/1990 | WO1990013383A1 Strip threading tension monitoring system |
| 10/29/1990 | CA2053267A1 Strip threading tension monitoring system |
| 10/18/1990 | DE4010268A1 Magnetic forming of metals - using electric-magnet with superconductive coils |
| 10/13/1990 | CA2011736A1 Method and means for metal working using superconducting magnetohydrodynamics |
| 10/10/1990 | EP0390925A1 Crack growth limiter in high-pressure welded pipelines and method of making it |
| 10/09/1990 | US4961576 Constant wall shaft with reinforced tip |
| 10/03/1990 | EP0389558A1 Process and apparatus for producing spirally-seamed metal tubing |
| 10/02/1990 | US4959985 Method of manufacturing metallic tube with spiral fin |
| 09/26/1990 | EP0389085A1 Continuously balanced apparatus for storing and dispensing materials |
| 09/26/1990 | EP0388824A2 Method and apparatus for drawing tubular bodies |
| 09/26/1990 | CN1045541A Apparatus for continuous production of small-diameter welded pipes |
| 09/20/1990 | WO1990010513A1 Machine tool for cutting out transverse ribs on a rectangular cross-section element for heat exchanger |
| 09/20/1990 | WO1990010511A1 Apparatus for forming a pipe from a sheet metal plate |
| 09/20/1990 | WO1990010510A1 Apparatus for forming a pipe from a sheet metal plate |
| 09/20/1990 | WO1990010509A1 Apparatus for the continuous production of small-diameter welded pipes |
| 09/19/1990 | EP0387425A1 Apparatus for the continuous production of small-diameter welded pipes |
| 09/19/1990 | CN1009622B Monolayer braze welding pipe |
| 09/18/1990 | CA1274122A1 Manufacture of a composite tube |
| 09/05/1990 | EP0385907A1 Process for obtaining copper wire starting from scrap |
| 09/05/1990 | EP0385719A2 Method and apparatus for metal sizing employing thermal expansion and contraction |
| 09/05/1990 | CN1045041A Method and apparatus for making clad core wire |
| 09/04/1990 | US4954682 Internal weld bead metallizing system and method |
| 08/29/1990 | EP0384721A1 Pipe cutting device |
| 08/29/1990 | EP0384625A1 Apparatus for forming spiral pipe |
| 08/22/1990 | EP0383742A1 Machine for manufacturing helically-seamed tubing |
| 08/17/1990 | CA2010276A1 Machine for manufacturing helically-seaming |
| 08/14/1990 | US4947671 Device for manufacturing conical poles |
| 08/14/1990 | US4947669 Apparatus for providing tubing with at least one internal spinal fin |
| 08/09/1990 | WO1990008719A1 Hollow worm conveyer made of strip material and method for making it |
| 08/08/1990 | EP0381116A2 Method and apparatus for shaping metal tubes into conical or tapering bodies |
| 08/07/1990 | US4945743 Apparatus for manufacturing electric welded pipes under hot conditions |