C21D 1/09
By direct application of electrical or wave energy
Official title: by direct application of electrical or wave energy; by particle radiation
C21D1/09 (By direct application of electrical or wave energy) appears on 625 US grants and 590 published applications in this corpus.
Search patents in C21D- Granted patents
- 625
- Published applications
- 590
- Assignees
- 430
- Inventors
- 1,665
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 6 | 0 |
| 1978 | 4 | 0 |
| 1979 | 4 | 0 |
| 1980 | 3 | 0 |
| 1981 | 5 | 0 |
| 1982 | 5 | 0 |
| 1983 | 5 | 0 |
| 1984 | 7 | 0 |
| 1985 | 10 | 0 |
| 1986 | 5 | 0 |
| 1987 | 13 | 0 |
| 1988 | 11 | 0 |
| 1989 | 12 | 0 |
| 1990 | 7 | 0 |
| 1991 | 5 | 0 |
| 1992 | 10 | 0 |
| 1993 | 11 | 0 |
| 1994 | 12 | 0 |
| 1995 | 9 | 0 |
| 1996 | 9 | 0 |
| 1997 | 6 | 0 |
| 1998 | 12 | 0 |
| 1999 | 20 | 0 |
| 2000 | 15 | 0 |
| 2001 | 16 | 2 |
| 2002 | 16 | 14 |
| 2003 | 12 | 10 |
| 2004 | 11 | 21 |
| 2005 | 13 | 17 |
| 2006 | 12 | 24 |
| 2007 | 6 | 18 |
| 2008 | 7 | 23 |
| 2009 | 8 | 31 |
| 2010 | 18 | 38 |
| 2011 | 13 | 26 |
| 2012 | 15 | 32 |
| 2013 | 21 | 28 |
| 2014 | 23 | 26 |
| 2015 | 19 | 35 |
| 2016 | 21 | 34 |
| 2017 | 18 | 24 |
| 2018 | 25 | 28 |
| 2019 | 29 | 41 |
| 2020 | 28 | 21 |
| 2021 | 19 | 18 |
| 2022 | 21 | 15 |
| 2023 | 14 | 24 |
| 2024 | 10 | 13 |
| 2025 | 13 | 17 |
| 2026 | 6 | 10 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Housing of an induction hardening tool6 Oct 2026US 12,752,288 B2Aktiebolaget Skf
- Surface-hardened, rotationally symmetrical workpiece, hardening method and hardening apparatus1 Sep 2026US 12,723,286 B2Walzengiesserei Coswig GmbH
- Volume heat treatment method and related system4 Aug 2026US 12,698,541 B2Laser Engineering Applications
- Thermal processing of closed shape workpieces28 Jul 2026US 12,692,568 B2Beijing E-Town Semiconductor Technology Co., Ltd.
- Methods for producing locally hardened components30 Jun 2026US 12,668,850 B1Southwest Technology and Engineering Research Institute
- Laser hardening installation for laser hardening a bearing component3 Sep 2026US 2026/0257300 A1
- Magnetically enhanced induction heat treating application27 Aug 2026US 2026/0250796 A1Ajax Tocco Magnethermic Corporation
- Railway axle30 Jul 2026US 2026/0218349 A1Nippon Steel Corporation
- Method for heating a steel intermediate strip when producing a flat steel strip23 Jul 2026US 2026/0210634 A1Primetals Technologies Austria GmbH
- System and method for processing or joining materials and their their application23 Jul 2026US 2026/0214779 A1Eurotek International Spolka Z Ograniczona Odpowiedzialnoscia
Most cited
By later US patents
- Surface hardening of cams of motor-vehicle camshafts1,402US 4,312,685 AAudi NSU Auto Union Aktiengesellschaft · 1982
- Magnetically coded device145US 5,631,093 AGeneral Motors Corporation · 1997
- Laser beam shaping device and process including a rotating mirror105US 5,925,271 AFraunhofer-Gesellschaft zur Förderung der angewandten Forschung e. V. · 1999
- Skin melting101US 4,122,240 AUnited Technologies Corporation · 1978
- Surface modification99US 4,015,100 AAvco Everett Research Laboratory, Inc. · 1977