| Patents for B21D 53 - Making other particular articles (18,517) |
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| 10/01/1991 | CA1289776C Camshaft and method for its production |
| 09/26/1991 | DE4109331A1 Method of forming teeth clip for hose - uses press tools which form teeth in two stage operation on flat strip of metal |
| 09/26/1991 | DE4006777A1 Heat exchanger plate mfr. - by formation of final internal and external contours before corrugation |
| 09/25/1991 | CN1054729A Method and apparatus for mixing solid or semi-solid wastes with additives |
| 09/19/1991 | WO1991013707A1 Stabilizer bar and method and apparatus for manufacturing the same |
| 09/19/1991 | DE4008216A1 Mfg. radial blade ring impellers, etc. - forms comb-shaped blank from flat metal and bends tines to form blades |
| 09/18/1991 | CN1054549A Contouring of metal sheets |
| 09/17/1991 | CA1289131C Finned heat exchanger tubing with varying wall thickness |
| 09/16/1991 | CA2034346A1 Method for shaping filament reinforced annular objects |
| 09/11/1991 | EP0446189A1 Bicycle drop-out and method of attachment |
| 09/11/1991 | EP0446119A1 Manufacturing method of a fan rotor for rotating electric machines, particularly for alternators for cars, and fan rotor obtained by such a method |
| 09/09/1991 | CA2011918A1 Assembly for storing and dispensing strips of material, and process for manufacturing same |
| 09/05/1991 | WO1991013309A1 Package of plates for tube-plate heat exchanger with diffuser-confuser channels and a rotor die for making the plates of said package |
| 09/04/1991 | CN2083970U Improved drill bit screw nail making machine |
| 09/04/1991 | CN1013744B Precision roil-forming technology of bearing race |
| 09/03/1991 | US5044611 Automatic installation for the forming and thermal treatment of circular pieces |
| 09/03/1991 | CA1288258C Pressure signal instrumentation having removable flanges and mounting method therefor |
| 08/29/1991 | DE4104997A1 Bending hollow metal frame extrusion - by fitting male tool inside, placing in slotted female tools which partly surround it, and bending in machine using polyamide for all tools |
| 08/27/1991 | US5042138 Method and apparatus for manufacturing a corrugated pipe |
| 08/27/1991 | US5042124 Machine for punching out butterfly clips for fastening to a frame of a spring core |
| 08/22/1991 | WO1991012099A1 Die for beading metallic gasket |
| 08/21/1991 | EP0442036A2 Leaf spring cambering method and apparatus |
| 08/20/1991 | US5040405 Tube expander |
| 08/14/1991 | CN1053762A Method and device for forming a sheet-metal blank, in particular in order to make a cathode ray tube mask, and cathode ray tube mask obtained according to this method |
| 08/13/1991 | US5038450 Assembled shaft |
| 08/13/1991 | CA1287483C Process and device for lining a peripheral tube of a steam generator |
| 08/07/1991 | EP0314682B1 Apparatus for loading radiator fins into trays |
| 08/07/1991 | CN2082207U Cold spin pressing lathe |
| 08/06/1991 | US5037681 Flexible resin finishing film on metal strip |
| 08/06/1991 | CA1287227C Hollow shaft having drive elements with axially varied material properties being secured on the hollow shaft by expansion of the hollowshaft |
| 07/31/1991 | CN2081963U Coiled pipe type radiator and cooler and coiling machine |
| 07/30/1991 | US5035051 Method of manufacturing a bearing bush |
| 07/30/1991 | CA1287086C Paint drain closure, attachment tool and method |
| 07/24/1991 | EP0437978A1 Stamping and forming machine having interchangeable punch subassembly |
| 07/23/1991 | US5033190 Method for controlling a tube expander |
| 07/23/1991 | CA1286616C Clutch rotor for an electromagnetic clutch and method of production thereof |
| 07/17/1991 | EP0436996A1 Piston Rings |
| 07/16/1991 | US5032201 Method for the production of a combustion chamber for solid propellant rocket motor |
| 07/16/1991 | US5031433 Method and apparatus for manufacturing a pulley |
| 07/16/1991 | US5031296 Machine tool for manufacturing pulleys or wheels |
| 07/04/1991 | CA2007129A1 Machine for cutting lateral fins on a heat exchanger element of rectangular cross section |
| 07/03/1991 | EP0435722A1 Method and device for forming a sheet metal blank in particular for producing a mask for a cathode ray tube |
| 07/03/1991 | CN1052621A Making method of base riser |
| 07/02/1991 | US5027763 One-piece push rod having enlarged spherical seat |
| 07/02/1991 | US5027508 Method of manufacturing an aluminum wheel |
| 06/26/1991 | CN1052441A Method and apparatus for producing corrugated expanding ring of bearing |
| 06/26/1991 | CN1012983B Copper-clad-steel bimetallic tube and preparation method thereof |
| 06/25/1991 | US5025977 Bicycle drop-out and method of attachment |
| 06/20/1991 | DE3941718A1 Attaching of cams to hollow camshaft - by diametral expansion of camshaft by hydraulic pressure and axial load |
| 06/19/1991 | EP0432551A2 Method of making a centering ring in a clamp leg of a U-shaped sheet-metal nut |
| 06/19/1991 | CA2032456A1 Blank forming process and apparatus, namely for producing a cathode tube mask, and mask so produced |
| 06/18/1991 | US5024368 Stopping-off method for use with diffusion bonding |
| 06/12/1991 | EP0431161A1 Machine tool for cutting out transverse ribs on a rectangular cross-section element for heat exchanger |
| 06/11/1991 | US5022299 Method of making a knife having a scalloped cutting edge |
| 06/11/1991 | US5022129 Crankshaft-forming apparatus and method |
| 06/06/1991 | CA2020408A1 One-piece push rod having enlarged spherical seat |
| 06/04/1991 | US5020218 Method for manufacturing a refrigerator cold head housing |
| 06/04/1991 | CA1284551C Anvil assembly |
| 05/29/1991 | EP0429327A1 Manufacturing method and apparatus to produce a shell and telescopic articulated universal joint including that shell |
| 05/29/1991 | EP0429104A1 Method and apparatus for manufacturing wheel rims |
| 05/29/1991 | CN2077764U Wobbly roller with plane static pressure thrust bearing |
| 05/28/1991 | US5018899 Yoke for universal joint and manufacturing method therefor |
| 05/28/1991 | US5018263 Method for making a metal screen door frame |
| 05/22/1991 | EP0427916A2 Process for the production of torsional damper |
| 05/17/1991 | CA2029439A1 Process for the manufacture of a torsional vibration damper |
| 05/16/1991 | WO1991006384A1 Spin molding apparatus |
| 05/14/1991 | US5014422 Method and apparatus for forming core assemblies |
| 05/08/1991 | EP0426064A2 High-pressure filter assembly, method and apparatus for forming high pressure filters |
| 05/08/1991 | EP0425924A1 Profile rolling machine for the production of circumferentially profiled, hollow cylindrical or cup-shaped platework-pieces |
| 05/08/1991 | EP0425836A2 Method for manufacturing a telescopic covering |
| 05/08/1991 | EP0425817A2 Manufacturing method for a telescopic covering |
| 05/08/1991 | DE3936648A1 Disc-type machine component - has thickened outer edge formed by rolling over sheet metal blank |
| 05/07/1991 | US5012663 Method of bending a ball point pen tip |
| 05/01/1991 | CN2075992U Roll squeezer for steel window frame for push-pull type glass of automobile |
| 05/01/1991 | CN1050998A A method of processing parts of cycle's break fork |
| 04/30/1991 | US5010759 Wheel rim shaping apparatus having a single cotter supportable at both ends thereof |
| 04/24/1991 | EP0423868A1 Bearings |
| 04/23/1991 | US5009093 Apparatus and method for roll forming and marking sheet metal |
| 04/16/1991 | US5007801 Impeller made from a sheet-metal disk and method of manufacturing same |
| 04/16/1991 | US5007282 Stamping and forming machine having interchangeable punch sub-assembly |
| 04/16/1991 | US5007270 Web handling apparatus for metal ribbon stock |
| 04/16/1991 | US5007165 Method of producing a cam shaft |
| 04/11/1991 | DE4031177A1 Fan rotor mfr. esp. for motor vehicle alternator - involves sectioning and bending of metallic strip to form integral blades and connections in polygonal annulus |
| 04/10/1991 | CN2074689U Liquid pressure increasing shaping device for concave and convex heat exchanging plate |
| 04/09/1991 | US5006025 Self-locking nut |
| 04/02/1991 | US5004370 Hollow shaft having drive elements with axially varied material properties being secured on the hollow shaft by expansion of the hollow shaft |
| 04/02/1991 | US5003691 Mechanical tube expander with hairpin bend support |
| 03/26/1991 | US5001918 Method and apparatus for making blanks of a profile varying lengthwise |
| 03/26/1991 | CA1281943C2 Spacer for multiple-pane windows |
| 03/21/1991 | WO1991003657A1 Synchronising ring |
| 03/19/1991 | CA1281599C Arrangement for profiling forwardly indexed material webs |
| 03/13/1991 | EP0416239A1 Procedure for the fabrication of a crunkshaft or a corresponding structural component |
| 03/13/1991 | CN1049809A Manufacturing method of aluminium tuke plate type heat exchanger and equipment thereof |
| 03/12/1991 | US4998349 Key-cutting device |
| 03/07/1991 | DE4027884A1 Synchronising ring for vehicle gear clutch - has two parallel conical surfaces with profiling on and frictional coating |
| 03/06/1991 | EP0414738A1 Process for manufacturing bucket wheel bodies and bucket wheel bodies so obtained. |
| 02/27/1991 | EP0414435A2 Method of manufacturing a heat exchanger |
| 02/27/1991 | EP0413983A1 Production method for a channeled wall thrust nozzle |
| 02/27/1991 | EP0413920A1 Device for exactly fastening several parts to a hollow body |
| 02/26/1991 | US4995252 Method and apparatus for internally enhancing heat exchanger tubing |