| Patents for B21D 3 - Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts (4,094) |
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| 09/01/1981 | US4286452 Machine for straightening elongated workpieces |
| 08/06/1981 | WO1981002120A1 Device for straightening of pipes |
| 04/21/1981 | US4262517 Method of correcting distorted pipe end |
| 03/17/1981 | US4255860 Calibrating apparatus for inside and outside surfaces and alignment of pipe sections |
| 03/03/1981 | US4253324 Drill pipe reforming method and apparatus |
| 02/24/1981 | CA1096150A1 Method and apparatus for the surface working and for reworking of workpieces |
| 01/14/1981 | EP0022136A1 Straightening machine with obliquely mounted rolls |
| 12/23/1980 | CA1091955A1 Motion producing and transmitting mechanism |
| 12/16/1980 | US4239101 Quick change apparatus for guide rollers |
| 10/07/1980 | US4226111 Method and apparatus for the surface working and for reworking of workpieces |
| 10/01/1980 | EP0016422A1 Straightening machine for thin-walled pipes |
| 10/01/1980 | EP0016267A1 Material tensioning method and apparatus |
| 09/16/1980 | US4222259 Propeller reconditioner |
| 08/26/1980 | US4218906 Material tensioning method and apparatus |
| 08/12/1980 | US4216666 Method of relieving stress in extruded sections |
| 07/09/1980 | EP0012829A1 Straightening machine |
| 07/08/1980 | CA1081105A2 Attaching, rotational, self-alignment apparatus |
| 07/01/1980 | US4210014 Cable straightener |
| 06/03/1980 | CA1078645A1 Tubular member straightening, descaling and hydraulic testing apparatus |
| 05/28/1980 | EP0011152A1 Thermal homogenization of steam generating tubing |
| 05/20/1980 | US4203308 Apparatus for testing and straightening arrow shafts and the like |
| 04/08/1980 | CA1075139A1 Rail straightening press |
| 03/19/1980 | EP0008625A1 Method and device for elongating a hot rolled wire containing 0,1 - 1% of carbon and with a diameter do of up to 20 mm by a cold forming process |
| 02/19/1980 | US4188813 Method and machine for the manufacture of long concrete drills provided with helical splines over part of their length |
| 02/05/1980 | CA1071080A1 Apparatus and method for straightening elongated workpieces |
| 01/22/1980 | US4184356 Tool for straightening plumber's snakes |
| 12/25/1979 | CA1068589A Method of straightening firearm barrels |
| 12/18/1979 | CA1068203A1 Apparatus for stretching sheet-metal strips |
| 12/18/1979 | CA1068198A1 Method for making tubular members and product thereof |
| 12/12/1979 | EP0006074A1 Device and method for calibrating and straightening tubes by means of a calibrating unit provided with calibrating jaws |
| 12/04/1979 | US4176537 Method of and means for straightening bars and tubes |
| 10/23/1979 | CA1064806A1 Heavy duty mobile pipe straightening machine of relatively light-weight construction |
| 09/25/1979 | US4168994 Thermal homogenization of steam generating tubing |
| 08/28/1979 | US4165626 Wash water supplying drive head and scraper and cutter assembly |
| 08/08/1979 | EP0003356A1 Straightening machine for elongated work-pieces |
| 08/07/1979 | CA1059839A1 Process and apparatus for making metal outers and inners |
| 06/05/1979 | US4157023 Apparatus and method for laying pipelines |
| 05/29/1979 | US4156360 Method and apparatus for unstressing pipe and the resulting pipe |
| 05/22/1979 | US4155241 Rasp bar straightener for combines |
| 05/15/1979 | US4154073 Automatic straightening machine |
| 04/17/1979 | CA1052664A1 Apparatus for straightening elongated workpieces |
| 04/03/1979 | US4147046 Heavy duty mobile pipe straightening machine of relatively light-weight construction |
| 04/03/1979 | CA1051823A1 Apparatus for stretching extruded lengths of metal |
| 03/20/1979 | US4144730 Production workpiece straightening system |
| 03/13/1979 | US4143534 Workpiece feed channel |
| 02/27/1979 | US4141679 Stretching machine |
| 02/06/1979 | US4137743 Process and apparatus for bending two tubes with one extending through the other |
| 02/06/1979 | CA1047900A1 Method for producing large diameter steel pipes |
| 01/30/1979 | CA1047381A1 Vehicle axle straightening system |
| 12/26/1978 | US4131005 Tubular member straightening, descaling and hydraulic testing apparatus |
| 09/26/1978 | US4116037 Tubing sizer and straightener |
| 09/05/1978 | US4111025 Straightening mill for section steel |
| 05/23/1978 | US4090381 Device for drawing-off and straightening cylindrically shaped stock |
| 04/25/1978 | US4085605 Method and apparatus for plastic deformation at high ambient pressure |
| 04/25/1978 | US4085492 Bending and straightening mechanism for mine roof bolts |
| 03/21/1978 | US4079610 Apparatus for stretching extruded lengths of metal |
| 03/07/1978 | US4077248 Rail straightening press |
| 02/28/1978 | US4076136 Pipe straightening and spinning method and apparatus |
| 02/07/1978 | US4072040 Pile straightener |
| 02/07/1978 | US4072035 Strengthening of a welding seam |
| 01/10/1978 | US4067222 Vehicle axle straightening system |
| 01/03/1978 | US4065949 Straightening apparatus |
| 12/06/1977 | US4061008 Rolls of a skewed-roll machine for trueing cylindrical metal articles |
| 12/06/1977 | US4061006 Method of straightening firearm barrels |
| 11/15/1977 | US4057988 Rectifying equipment of bar material |
| 11/08/1977 | US4056958 Method and apparatus for straightening of elongated workpieces |
| 11/01/1977 | US4055981 Portable guardrail straightener for field use |
| 09/27/1977 | US4050278 Apparatus for conveying products extruded out of an extruding press |
| 09/27/1977 | US4050275 Method and apparatus for aligning a valve head |
| 09/20/1977 | US4048825 Coil re-bar straightener and cutter |
| 09/13/1977 | US4047418 Combined drawing and straightening machine for metallic tubes or rods |
| 09/06/1977 | US4046177 Machine for straightening wires |
| 08/23/1977 | US4043162 Roller assembly for sheet-bending head and method of making roller bearings therefor |
| 08/02/1977 | US4038861 Workpiece feed channel |
| 07/26/1977 | US4037447 Planetary straightening machine |
| 06/21/1977 | US4030332 Machine for straightening elongated workpieces |
| 05/10/1977 | US4022046 Method of and apparatus for straightening steel sections |
| 03/29/1977 | US4014196 Straightening apparatus |
| 01/18/1977 | US4003233 Bending and straightening mechanism for mine roof bolts |
| 12/21/1976 | US3998083 Straightening apparatus |
| 11/23/1976 | US3992962 Driving train for straightening rolls |
| 11/23/1976 | US3992918 Nail straightener |
| 10/19/1976 | US3986654 Method for making tubular members and product thereof |
| 10/12/1976 | US3985013 Apparatus for rapidly changing straightening rollers of a roller straightening machine |
| 09/14/1976 | US3979937 Paired-roll straightening machine |
| 09/07/1976 | US3979231 Method for producing large diameter steel pipes |
| 07/20/1976 | US3969919 Workpiece feed channel |
| 04/27/1976 | US3952936 Reforming pipe clamp |
| 04/20/1976 | US3950978 Stretch-forming of long tubes |
| 04/13/1976 | US3949588 Straightening press for rod-like workpiece |
| 04/06/1976 | US3948076 Automatic process and aligning apparatus having a plurality of aligning stations |
| 03/16/1976 | US3943746 Automatic aligning process and aligning press having a single aligning station |
| 01/20/1976 | US3933018 Method and apparatus for straightening end sections of elongated workpieces |
| 01/06/1976 | US3930392 Straightening machine |