C21D 1/34
Methods of heating
Official title: Methods of heating (C21D1/06 takes precedence)
C21D1/34 (Methods of heating) appears on 1,173 US grants and 1,302 published applications in this corpus.
Search patents in C21D- Granted patents
- 1,173
- Published applications
- 1,302
- Assignees
- 696
- Inventors
- 3,074
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 10 | 0 |
| 1977 | 8 | 0 |
| 1978 | 15 | 0 |
| 1979 | 12 | 0 |
| 1980 | 14 | 0 |
| 1981 | 3 | 0 |
| 1982 | 9 | 0 |
| 1983 | 16 | 0 |
| 1984 | 13 | 0 |
| 1985 | 11 | 0 |
| 1986 | 16 | 0 |
| 1987 | 8 | 0 |
| 1988 | 10 | 0 |
| 1989 | 9 | 0 |
| 1990 | 7 | 0 |
| 1991 | 10 | 0 |
| 1992 | 7 | 0 |
| 1993 | 12 | 0 |
| 1994 | 19 | 0 |
| 1995 | 16 | 0 |
| 1996 | 15 | 0 |
| 1997 | 8 | 0 |
| 1998 | 16 | 0 |
| 1999 | 15 | 0 |
| 2000 | 22 | 0 |
| 2001 | 11 | 4 |
| 2002 | 16 | 13 |
| 2003 | 12 | 19 |
| 2004 | 16 | 24 |
| 2005 | 22 | 21 |
| 2006 | 9 | 19 |
| 2007 | 11 | 20 |
| 2008 | 8 | 22 |
| 2009 | 16 | 47 |
| 2010 | 9 | 53 |
| 2011 | 18 | 35 |
| 2012 | 17 | 51 |
| 2013 | 31 | 60 |
| 2014 | 34 | 70 |
| 2015 | 36 | 110 |
| 2016 | 48 | 97 |
| 2017 | 59 | 95 |
| 2018 | 78 | 78 |
| 2019 | 76 | 85 |
| 2020 | 74 | 58 |
| 2021 | 58 | 64 |
| 2022 | 58 | 62 |
| 2023 | 51 | 57 |
| 2024 | 41 | 49 |
| 2025 | 41 | 50 |
| 2026 | 22 | 39 |
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
- Grain-oriented electrical steel sheet and method of manufacturing same1 Sep 2026US 12,723,287 B2Jfe Steel Corporation
- Spatially selective electromagnetic field assisted processing of bulk crystalline soft magnetic alloys18 Aug 2026US 12,709,780 B2University of Pittsburgh—Of the Commonwealth System of Higher Education
- Dual-frequency power-supply apparatus, high-frequency heating apparatus, and high-frequency quenching apparatus11 Aug 2026US 12,706,545 B2Neturen Co., Ltd.
- Volume heat treatment method and related system4 Aug 2026US 12,698,541 B2Laser Engineering Applications
- Heat treatment methods for multiphase superalloys24 Sep 2026US 2026/0286454 A1General Electric Company
- Integrated welding and thermal processing joining method for creep strength enhanced ferritic steels3 Sep 2026US 2026/0257302 A1Kva Technologies
- Method and system for temperature controlled pre-spinning of rotor forgings3 Sep 2026US 2026/0262140 A1Schenck USA Corp.
- Hot stamping component and manufacturing method therefor27 Aug 2026US 2026/0249342 A1Hyundai Steel Company
- Magnetically enhanced induction heat treating application27 Aug 2026US 2026/0250796 A1Ajax Tocco Magnethermic Corporation
Most cited
By later US patents
- Heat treatment with an autoregulating heater259US 4,623,401 AMetcal, Inc. · 1986
- Generating electromagnetic fields in a self regulating temperature heater by positioning of a current return bus175US 5,065,501 AAMP Incorporated · 1991
- Magnetically coded device145US 5,631,093 AGeneral Motors Corporation · 1997
- Method and system for selectively softening hot stamped parts by induction heating94US 10,308,992 B2Ford Motor Company · 2019
- Method for thermomagnetic encoding of permanent magnet materials79US 5,492,572 AGeneral Motors Corporation · 1996