B21B
Rolling of metal
Official title: ROLLING OF METAL (auxiliary operations used in connection with metal-working operations covered in B21, see B21C; bending by rolling B21D; manufacture of particular objects, e.g. screws, wheels, rings, barrels, balls, by rolling B21H; pressure welding by means of a rolling mill B23K20/04)
B21B (Rolling of metal) appears on 6,811 US grants and 4,382 published applications in this corpus.
Search patents in B21B- Granted patents
- 6,811
- Published applications
- 4,382
- Assignees
- 2,009
- Inventors
- 12,210
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 116 | 0 |
| 1977 | 139 | 0 |
| 1978 | 127 | 0 |
| 1979 | 85 | 0 |
| 1980 | 119 | 0 |
| 1981 | 104 | 0 |
| 1982 | 80 | 0 |
| 1983 | 123 | 0 |
| 1984 | 127 | 0 |
| 1985 | 133 | 0 |
| 1986 | 139 | 0 |
| 1987 | 134 | 0 |
| 1988 | 124 | 0 |
| 1989 | 130 | 0 |
| 1990 | 160 | 0 |
| 1991 | 132 | 0 |
| 1992 | 137 | 0 |
| 1993 | 112 | 0 |
| 1994 | 120 | 0 |
| 1995 | 141 | 0 |
| 1996 | 133 | 0 |
| 1997 | 171 | 0 |
| 1998 | 180 | 0 |
| 1999 | 199 | 0 |
| 2000 | 182 | 0 |
| 2001 | 187 | 43 |
| 2002 | 136 | 118 |
| 2003 | 115 | 110 |
| 2004 | 94 | 144 |
| 2005 | 77 | 94 |
| 2006 | 83 | 105 |
| 2007 | 78 | 134 |
| 2008 | 57 | 121 |
| 2009 | 55 | 167 |
| 2010 | 81 | 188 |
| 2011 | 105 | 143 |
| 2012 | 130 | 166 |
| 2013 | 140 | 205 |
| 2014 | 99 | 213 |
| 2015 | 160 | 284 |
| 2016 | 175 | 213 |
| 2017 | 195 | 210 |
| 2018 | 172 | 244 |
| 2019 | 204 | 210 |
| 2020 | 184 | 209 |
| 2021 | 162 | 208 |
| 2022 | 180 | 192 |
| 2023 | 180 | 196 |
| 2024 | 147 | 181 |
| 2025 | 152 | 154 |
| 2026 | 116 | 130 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Main groups
Granted patents with any code in the group
- B21B 1/00Metal-rolling methods or mills for making semi-finished products of solid or profiled2,390
- B21B 37/00Control devices or methods specially adapted for metal-rolling mills or the work1,340
- B21B 45/00Devices for surface or other treatment of work, specially combined with or1,263
- B21B 31/00Rolling stand structures1,071
- B21B 27/00Rolls, roll alloys or roll fabrication988
- B21B 13/00Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and976
- B21B 3/00Rolling materials of special alloys so far as the composition of the742
- B21B 39/00Arrangements for moving, supporting, or positioning work, or controlling its movement, combined700
All 37 main groupsShow fewer
- B21B 38/00Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling638
- B21B 15/00Arrangements for performing additional metal-working operations specially combined with or arranged in603
- B21B 35/00Drives for metal-rolling mills318
- B21B 2203/00Auxiliary arrangements, devices or methods in combination with rolling mills or rollingIndexing code238
- B21B 2261/00Product parametersIndexing code235
- B21B 19/00Tube-rolling by rollers arranged outside the work and having their axes not219
- B21B 17/00Tube-rolling by rollers of which the axes are arranged essentially perpendicular to214
- B21B 2267/00Roll parametersIndexing code189
- B21B 2265/00Forming parametersIndexing code176
- B21B 25/00Mandrels for metal tube rolling mills161
- B21B 2273/00Path parametersIndexing code156
- B21B 28/00Maintaining rolls or rolling equipment in effective condition140
- B21B 2275/00Mill drive parametersIndexing code132
- B21B 21/00Pilgrim-step tube-rolling , i.e. pilger mills129
- B21B 2201/00Special rolling modesIndexing code122
- B21B 23/00Tube-rolling not restricted to methods provided for in only one of groups108
- B21B 2269/00Roll bending or shiftingIndexing code106
- B21B 29/00Counter-pressure devices acting on rolls to inhibit deflection of same under load105
- B21B 41/00Guiding, conveying, or accumulating easily-flexible work102
- B21B 43/00Cooling beds, whether stationary or moving99
- B21B 2263/00Shape of productIndexing code86
- B21B 9/00Measures for carrying out rolling operations under special conditions65
- B21B 2271/00Mill stand parametersIndexing code57
- B21B 33/00Safety devices not otherwise provided for42
- B21B 5/00Extending closed shapes of metal bands by rolling33
- B21B 2205/00Particular shaped rolled productsIndexing code25
- B21B 47/00Auxiliary arrangements, devices or methods in connection with rolling of multi-layer sheets17
- B21B 11/00Subsidising the rolling process by subjecting rollers or work to vibrations14
- B21B 99/00Subject matter not provided for in other groups of this subclass7
Recent patents
- Manufacturing method for tinplate6 Oct 2026US 12,752,324 B2Institute of Research of Iron and Steel, Jiangsu Province/Sha-Steel, Co. Ltd (Cn)
- Forged steel roll for cold rolling6 Oct 2026US 12,752,325 B2Nippon Steel Corporation
- Temperature control system and temperature control method for hot rolling line6 Oct 2026US 12,752,326 B2TMEIC Corporation
- Sub-ambient temperature transfer system for cold forming processes22 Sep 2026US 12,741,304 B2GM Global Technology Operations LLC
- Rolling mill stand and method of changing a work roll assembly thereof22 Sep 2026US 12,741,305 B2Primetals Technologies, Limited
- Rolling mill stand with roll distance adjustment system8 Oct 2026US 2026/0307124 A1Danieli & C. Officine Meccaniche SpA
- Method and apparatus for determining rolling force in flat roller rolling process of corrugated composite plate8 Oct 2026US 2026/0307125 A1Taiyuan University of Technology
- Apparatus and method for receiving and unloading rolled bar8 Oct 2026US 2026/0307126 A1Danieli & C. Officine Meccaniche SpA
- Method of making thick aluminum alloy products8 Oct 2026US 2026/0308740 A1Arconic Technologies LLC
- Multiple-billet hot rolling plant with joint cooling system1 Oct 2026US 2026/0295647 A1Pomini Long Rolling Mills S.R.I.
Most cited
By later US patents
- Method and apparatus for eccentricity correction in a rolling mill483US 4,126,027 AWestinghouse Electric Corp. · 1978
- High-capacity wire rolling mill195US 5,946,783 ASMS Schloemann-Siemag Aktiengesellschaft · 1999
- Time and work tracker for wireless devices177US 6,581,025 B2Discovision Associates · 2003
- Digital computer monitored and/or operated system or process which is structured for operation with an improved automatic programming process and system144US 4,215,406 AWestinghouse Electric Corp. · 1980
- Wear-resistant ceramic, cermet or metallic embossing surfaces, methods for producing same, methods of embossing articles by same and novel embossed articles112US 4,787,837 AUnion Carbide Corporation · 1988