| Patents for B21K 21 - Making hollow articles not covered by any single one of groups (1,317) |
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| 08/20/1992 | DE4104707A1 Forming of collar on end of thin walled tube - by upsetting end of tube by applying gradually increasing force |
| 07/21/1992 | US5131123 Methods of manufacturing a bullet |
| 07/21/1992 | CA1305316C Method for producing ring gears for heavy duty drive axles |
| 07/14/1992 | US5130207 Thin wall steel cartridge cases |
| 05/26/1992 | CA1301611C Method and apparatus for forming stabilizer bars having novel end constructions |
| 05/20/1992 | EP0486008A1 Manufacturing thin wall steel cartridge cases |
| 05/14/1992 | CA2055239A1 Manufacturing thin wall steel cartridge cases |
| 05/05/1992 | US5109888 High-pressure metallic pipe provided with connecting head part and method for formation thereof |
| 04/21/1992 | CA1298995C Method for producing a family of forged ring rolling preforms and forging die therefor |
| 03/17/1992 | US5096449 Method for manufacturing metal cylinder members of electron tubes and method for manufacturing magnetron anodes |
| 03/17/1992 | US5095731 Shell casing machine |
| 03/11/1992 | EP0474457A1 Channel forming apparatus |
| 03/10/1992 | CA1296931C Tool for cold forging tubular members |
| 02/27/1992 | DE4026921A1 Tubular metal workpieces prodn. - involves circular blanks stamped out of rolled strip of continuously cast material |
| 02/26/1992 | CN1015604B Process for manufacturing tubular semifinished copper alloy part |
| 02/25/1992 | US5090611 Method of making a cross joint between pipes |
| 02/18/1992 | US5088311 Method of making a tubular member |
| 12/24/1991 | CA1293530C Process for the production of an electrical battery pole or terminal, relating equipment and electrical battery pole or terminal thereby obtained |
| 10/08/1991 | US5054308 Forging punch |
| 10/08/1991 | CA1290172C Method for producing near net ring gear forgings |
| 09/24/1991 | US5050419 Method for eliminating of longitudinal upset seams |
| 09/17/1991 | US5048162 Manufacturing thin wall steel cartridge cases |
| 09/10/1991 | US5046348 Blind fastener for composite materials |
| 08/13/1991 | US5039355 Process for obtaining parts made of copper of very fine texture from a billet made by continuous casting |
| 07/02/1991 | US5027996 Method of manufacturing a hollow shaft with internal swellings of revolution and shaft obtained by this method |
| 07/02/1991 | US5027635 Channel hot-forming apparatus |
| 06/11/1991 | US5022931 Injecting inert gas into hole, fastening a cap, heating |
| 05/15/1991 | EP0426935A2 Process for hot working article defining hole at the center thereof |
| 05/08/1991 | EP0426312A2 Cold-forming dies and cold-forming process |
| 05/07/1991 | CA1283774C Piston ring manufacturing method |
| 04/30/1991 | CA2018372A1 Cold forming dies and cold forming process |
| 03/19/1991 | US4999901 Method of producing a nozzle member for sucking or transporting a string of yarn |
| 01/16/1991 | EP0270538B1 Tool for and method of making hollow articles |
| 01/09/1991 | CN1011122B Method for producing ring gears for heavy-duty drive axles |
| 12/27/1990 | EP0404570A2 A method of making a tubular member |
| 12/19/1990 | CN1010838B Method for producing near net ring gear forgings |
| 11/14/1990 | EP0397032A2 Method for manufacturing metal cylinder members of electron tubes and method for manufacturing magnetron anodes |
| 10/17/1990 | EP0392644A2 Method of removing longitudinal upset beads |
| 09/26/1990 | EP0389367A1 Method of making very fine-grained copper pieces from continuously cast blanks |
| 08/08/1990 | EP0381556A1 Tubular pin with internal bulges, and process for making the same |
| 08/07/1990 | US4945749 Cold forming dies and cold forming process |
| 07/12/1990 | DE3900186A1 Method for making a piston pin |
| 06/27/1990 | EP0374341A1 Bottle with a concave base and method of manufacturing same |
| 06/12/1990 | US4932251 Method of producing a core for a fuel injector |
| 04/24/1990 | US4918969 Forging method for a hollow article |
| 03/27/1990 | US4910991 Tube end double end forming method and apparatus |
| 01/30/1990 | US4896521 Process for manufacturing a tubular semifinished copper alloy part |
| 01/18/1990 | DE3922243A1 Apparatus for the production of hollow parts, especially on pressing machines or swaging machines and hydraulic presses |
| 01/03/1990 | EP0348798A1 Method of making a valve sleeve |
| 12/19/1989 | US4887449 Method for forming a piston having a peg |
| 11/28/1989 | US4882925 Method of making terminal nut for ignition plug by plastic working |
| 10/17/1989 | US4873752 Manufacturing method of the gas-flow valve nozzle of a lighter |
| 09/26/1989 | CA1260414A1 Integral joint forming of work-hardenable high alloy tubing |
| 09/05/1989 | US4862571 Method of making a valve sleeve |
| 08/15/1989 | US4856167 Method for producing near net ring gear forgings |
| 08/02/1989 | EP0326085A2 Production of nozzle member |
| 08/01/1989 | CA1257958A1 Method and apparatus for converting a single chambered conduit to a multi-chambered conduit |
| 07/11/1989 | US4845972 Method for working the ends of steel pipe by upsetting and pressing |
| 07/05/1989 | CN1033585A Process for manufacturing tubular semifinished copper alloy part |
| 07/04/1989 | US4843860 For creating a bell |
| 06/07/1989 | CN2038822U Forging die of an oxygen lance nozzle |
| 06/06/1989 | US4835856 Piston ring manufacturing method |
| 06/06/1989 | CA1255084A1 Method for producing clad tubular product |
| 05/16/1989 | US4829950 Lightweight, high strength, wear resistant |
| 05/09/1989 | US4827590 Method of making of header for automotive air conditioner evaporator |
| 05/03/1989 | EP0314267A2 Tool for cold forging tubular members |
| 04/05/1989 | EP0310085A2 Process for manufacturing a tubular semifinished copper alloy part |
| 02/14/1989 | US4803880 Hollow article forging process |
| 02/01/1989 | EP0138805B1 Unitary fastener insert for structural sandwich panels |
| 01/24/1989 | US4799303 Method of making a valve sleeve |
| 01/17/1989 | US4798077 Method for producing a family of forged ring rolling preforms and forging die therefor |
| 01/10/1989 | US4796457 Method and apparatus for producing flanged bush |
| 12/28/1988 | CN88100946A Method for producing near net ring gear forgings |
| 12/20/1988 | US4791796 Tool for cold forging tubular members |
| 11/29/1988 | US4787234 Method and apparatus for extruding superalloy material |
| 11/22/1988 | CA1245042A1 Tool for and method of making hollow articles |
| 11/01/1988 | US4781054 Apparatus for bending and forming heated tubular workpieces |
| 10/11/1988 | US4776197 Process and apparatus for producing an electrical battery pole or terminal |
| 10/04/1988 | US4774745 Method of producing fragmentation pattern in military projectiles |
| 10/04/1988 | CA1242570A1 Method of producing double-wall composite pipes |
| 10/04/1988 | CA1242563A1 Sizing molds for continuous casting |
| 09/06/1988 | US4768368 Tool for and method of making hollow articles |
| 08/24/1988 | CN88100761A Method for producing ring gears for heavy duty drive axles |
| 08/17/1988 | EP0278361A2 Method for producing ring gears for heavy duty drive axles |
| 08/17/1988 | EP0278306A2 Method for producing a family of forged ring rolling preforms and forging die therefor |
| 08/17/1988 | EP0278298A2 Method for producing near net ring gear forgings |
| 08/09/1988 | US4761867 Method for producing ring gears for heavy-duty drive axles |
| 06/22/1988 | EP0272186A1 Direct extrusion method at a vertical forging press, and equipment therefor |
| 06/15/1988 | EP0270538A1 Tool for and method of making hollow articles. |
| 05/31/1988 | US4747431 Integral joint forming of work-hardenable high alloy tubing |
| 04/07/1988 | DE3631607A1 Method for the production of a camshaft |
| 03/30/1988 | EP0261311A1 Process for the production of an electrical battery pole or terminal, relating equipment and electrical battery pole or terminal thereby obtained |
| 03/02/1988 | CN87105340A Method for manufacturing piston rings |
| 01/05/1988 | US4716756 Clutch drum |
| 12/17/1987 | DE3717606A1 Prodn. of munition shells |
| 09/08/1987 | CA1226535A1 Convex type bottom with a bearing rim for bottles for industrial gases obtained by means of hot forging from a steel billet and fixture for forming said bottom |
| 09/01/1987 | US4689864 Method of making valve sleeves |
| 07/14/1987 | CA1224018A1 Method of establishing sealed pipe lengths of plastic pipes by joining of pipe elements, particularly district heating pipe lengths |
| 07/01/1987 | EP0121531B1 Tool for and method of making hollow articles |
| 05/06/1987 | EP0220800A1 A powder-metallurgy method for producing tubular product |