| 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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| 02/13/1992 | DE4039863C1 Insulated double pipe - has nested pipes with foaming heat insulation in between, plus leakage sensor line below inner pipe, screened from insulation by cover film |
| 02/12/1992 | EP0470190A1 Strip threading tension monitoring system |
| 02/12/1992 | EP0397656B1 Process and device for manufacturing tubes with helically arranged seams |
| 01/28/1992 | WO1992002751A1 Casing and flexible tubular duct comprising same, and production method therefor |
| 01/28/1992 | CA2065840A1 Casing and flexible tubular duct comprising same, and production method therefor |
| 01/27/1992 | CA2023001A1 Insulated exhaust pipe and method and means for producing and connecting same |
| 01/22/1992 | CN1057978A Method and apparatus for shaping spiral steel tube and bend by hot push foreward |
| 01/16/1992 | DE4030389C1 Composite material tube - mfd. by winding metal foil on steel core and joining outermost or innermost layers explosively |
| 01/15/1992 | EP0466606A1 Process for manufacturing corrosion-resistant welded titanium alloy tubes and pipes |
| 01/15/1992 | EP0465946A1 Hard metal or ceramic bar, method and extrusion-die for its production |
| 01/14/1992 | US5079938 Process and apparatus for producing a helically seamed pipe |
| 01/09/1992 | WO1992000153A1 Method for producing ribbed tubes |
| 01/08/1992 | EP0464331A2 Procedure and device for the generation of short chips at the internal burring of straight head welded pipes |
| 01/07/1992 | CA1293854C Device for the production of pipes |
| 01/07/1992 | CA1293845C Method and device for grooving the face of a cylindrical object |
| 12/24/1991 | US5075175 Composite bar structures of interlocked multiple members |
| 12/24/1991 | US5074555 Tapered wall shaft with reinforced tip |
| 12/24/1991 | US5074138 Expandable-contractible |
| 12/24/1991 | US5074018 Method and device for the cutting of pipes into separate pipe sections |
| 12/19/1991 | DE4019117A1 Titanium (alloy) tubing prodn. - by welding together strip, cold rolling and recrystallisation annealing |
| 12/18/1991 | EP0461231A1 Sheet steel strip, process and device for manufacturing lock seam tubing with helical seams |
| 12/18/1991 | EP0461122A1 Distributed processing control system for automatic welding operation. |
| 12/12/1991 | WO1991018689A1 Method of manufacturing tubes |
| 12/11/1991 | EP0459988A1 Method for manufacturing of square pipes from coated steel strips. |
| 12/11/1991 | EP0195063B1 Method for providing a tubular node in a frame work truss structure such as offshore platforms for oil drilling and production |
| 12/10/1991 | US5071713 Metal fibers obtained by bundled drawing |
| 12/05/1991 | DE4017634A1 Continuously welding tube from coiled strip - by passing through shaping rollers induction heaters to pre-heat butting edges and finally welding with burner |
| 12/03/1991 | US5069382 Apparatus and method for producing a pressure vessel from metal tubing |
| 11/26/1991 | CA1292466C Finned heat transfer device and method for making same |
| 11/13/1991 | EP0456440A2 Pipe weld cover apparatus |
| 11/12/1991 | US5063798 Running circular pipe cutting device |
| 11/08/1991 | CA2041877A1 Pipe weld cover apparatus |
| 11/06/1991 | EP0454911A1 A preparation process for coextrusion billets with multiple metallic cylindrical layers |
| 10/31/1991 | WO1991016156A1 Tapered conduit |
| 10/30/1991 | CN1055685A Method and circuit arrangement controlled welding current according to welding speed |
| 10/23/1991 | EP0453182A1 Manufacture of metal tubes |
| 10/23/1991 | EP0453181A1 Manufacture of metal tubes |
| 10/22/1991 | US5058567 Flexible tube of endoscope and method of and apparatus for producing the same |
| 10/22/1991 | US5058269 Method of forming rectangular metal tubes |
| 10/22/1991 | CA1291114C Enhanced heat transfer surface and apparatus and method of manufacture |
| 10/19/1991 | CA2040667A1 Manufacture of metal tubes |
| 10/19/1991 | CA2040665A1 Manufacture of metal tubes |
| 10/17/1991 | DE4011681A1 Rolling stand with sliding roll shafts - for tube forming using hydraulically tensioned roll shafts axially withdrawn by integral cylinders for rapid roll changing |
| 10/16/1991 | EP0451464A2 Method and circuit for controlling the welding current, the welding power in response to the welding speed |
| 10/15/1991 | US5056346 Method and device for manufacturing bellows pipe |
| 10/09/1991 | EP0450865A2 Structural support |
| 10/08/1991 | US5054679 Apparatus for manufacturing plastic-lined pipe |
| 10/08/1991 | US5054185 Method of fabricating double pipe |
| 10/08/1991 | US5054146 Anchor bolt |
| 10/08/1991 | CA1290342C Bonding of halogenated polymers |
| 10/02/1991 | EP0449600A2 Multilayer tubing made from metal and production process therefor |
| 10/01/1991 | US5052476 Heat transfer tubes and method for manufacturing |
| 10/01/1991 | CA2039407A1 Multilayer tubing made from metal and production process therefor |
| 09/25/1991 | EP0447820A2 Method of making a composite metal wire |
| 09/25/1991 | EP0447612A2 Method of making a composite metal wire |
| 09/19/1991 | WO1991013702A1 Method and apparatus for forming one piece duct sections |
| 09/18/1991 | EP0447251A2 Tube and method of forming same |
| 09/18/1991 | CN1013934B Roll forming of metal articles |
| 09/17/1991 | US5049424 Fabric covered metal rail and method for producing same |
| 09/11/1991 | EP0446089A1 Method and apparatus for forming a circular lip around an opening |
| 09/11/1991 | EP0445904A2 Method of manufacturing a thick-walled high-pressure metal tube |
| 09/10/1991 | US5046351 Mold for forming a groove in a tube |
| 09/10/1991 | CA1288824C Method and apparatus for continuous production of tubular bodies by means of laser longitudinal seam welding |
| 09/04/1991 | EP0444389A1 Exhaust pipe-silencer combination and a method of manufacturing the parts thereof |
| 09/04/1991 | CN1013742B Method of and apparatus for producing tubes with small diameter and thick wall |
| 09/03/1991 | US5045131 Wear resistance, alloy of magnesium, silicon, boron and aluminum |
| 08/28/1991 | CN1054049A Apparatus for towing and guiding long articles |
| 08/21/1991 | EP0442037A1 Device to draw-off or guide long items |
| 08/20/1991 | US5040399 Method of fabricating box section from steel with walls that differ in thickness |
| 08/14/1991 | EP0441174A2 Method and form tool for heading a nipple |
| 08/08/1991 | DE4103230A1 Multi-wall steel pipe - formed from copper-coated roughened steel strip |
| 08/06/1991 | US5036693 Integral finned tubes and a method of manufacturing same |
| 08/06/1991 | US5036690 Flexible pipe end crimping apparatus |
| 07/31/1991 | EP0439031A1 Method of welding clad steel |
| 07/30/1991 | US5035042 Method for producing galvanized tubing |
| 07/30/1991 | CA1286934C Fuel pipe device for motor vehicles and process for producing same |
| 07/25/1991 | WO1991010518A1 Device for removing internal flash from a straight-weld electrowelded pipe |
| 07/25/1991 | DE4001825A1 Anticorrosion coated steel pipe welding |
| 07/23/1991 | US5033544 Looped fin heat exchanger and method for making same |
| 07/11/1991 | DE4020924C1 Method of deburring welded tube - has burr removed from tube surface and cut intermittently within tube |
| 07/09/1991 | CA1285884C Wound metallic exhaust gas catalyst carrier body having a geometrically complex cross-sectional shape, and method, apparatus and blank for producing the body |
| 07/05/1991 | WO1991010201A1 Distributed processing control system for automatic welding operation |
| 07/04/1991 | DE4042057A1 U=bend for connecting two parallel pipes - is made from two sheet metal pressing brazed together |
| 07/03/1991 | WO1991009693A1 Sheet steel strip, process and device for manufacturing lock seam tubing with helical seams |
| 07/03/1991 | CA2047747A1 Sheet steel strip, process and device for manufacturing lock seam tubing with helical seams |
| 07/02/1991 | US5027635 Channel hot-forming apparatus |
| 06/27/1991 | WO1991009188A1 Steel wire for reinforcing the embedding material, especially concrete, and process for making it |
| 06/26/1991 | CN1012983B Copper-clad-steel bimetallic tube and preparation method thereof |
| 06/25/1991 | US5025855 Condenser for use in a car cooling system |
| 06/23/1991 | CA2032881A1 Durable method for producing finned tubing |
| 06/19/1991 | EP0432457A2 Apparatus for helically winding tubes with flat, uncorrugated strip material and associated method |
| 06/19/1991 | CN1052265A Apparatus for roll forming metal articles |
| 06/13/1991 | DE4038979A1 Jacketed pipe for IC engine catalytic exhaust system |
| 06/12/1991 | EP0431649A2 Method for manufacturing a double-walled pipe, especially for exhaust devices of internal combustion engines provided with catalyst. |
| 06/12/1991 | EP0431161A1 Machine tool for cutting out transverse ribs on a rectangular cross-section element for heat exchanger |
| 06/11/1991 | US5022149 Method and apparatus for making a looped fin heat exchanger |
| 06/05/1991 | WO1991008064A1 Apparatus for manufacturing welded steel pipe and method of operating thereof |
| 06/05/1991 | EP0430542A2 Method of producing flexible tube |
| 06/04/1991 | US5020351 Apparatus for flattening irregular circumferential surfaces in spirally formed pipe |
| 05/29/1991 | EP0429166A1 Method and apparatus for forming heat exchanger tubes |