C21D 9/32
Heat treatment: for gear wheels, worm wheels, or the like
Official title: for gear wheels, worm wheels, or the like
C21D9/32 (Heat treatment: for gear wheels, worm wheels, or the like) appears on 316 US grants and 339 published applications in this corpus.
Search patents in C21D- Granted patents
- 316
- Published applications
- 339
- Assignees
- 192
- Inventors
- 728
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 3 | 0 |
| 1985 | 3 | 0 |
| 1986 | 1 | 0 |
| 1987 | 4 | 0 |
| 1988 | 5 | 0 |
| 1989 | 6 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 4 | 0 |
| 1994 | 4 | 0 |
| 1995 | 6 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 4 | 0 |
| 1999 | 6 | 0 |
| 2000 | 10 | 0 |
| 2001 | 6 | 0 |
| 2002 | 6 | 5 |
| 2003 | 6 | 7 |
| 2004 | 4 | 7 |
| 2005 | 2 | 11 |
| 2006 | 2 | 6 |
| 2007 | 2 | 7 |
| 2008 | 2 | 8 |
| 2009 | 3 | 11 |
| 2010 | 8 | 9 |
| 2011 | 7 | 14 |
| 2012 | 9 | 23 |
| 2013 | 11 | 30 |
| 2014 | 8 | 13 |
| 2015 | 22 | 19 |
| 2016 | 16 | 21 |
| 2017 | 13 | 19 |
| 2018 | 20 | 16 |
| 2019 | 15 | 24 |
| 2020 | 25 | 20 |
| 2021 | 15 | 12 |
| 2022 | 12 | 16 |
| 2023 | 12 | 9 |
| 2024 | 12 | 17 |
| 2025 | 6 | 9 |
| 2026 | 2 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Dual-frequency power-supply apparatus, high-frequency heating apparatus, and high-frequency quenching apparatus11 Aug 2026US 12,706,545 B2Neturen Co., Ltd.
- Induction hardening system7 Apr 2026US 12,595,524 B2Aktiebolaget Skf
- Case-hardened steel part for use in aeronautics23 Dec 2025US 12,503,742 B2Safran Helicopter Engines
- Cooling device for heat treatment1 Jul 2025US 12,345,480 B2Dongwoo Hst Co., Ltd.
- Gear component24 Jun 2025US 12,338,885 B2Hitachi Construction Machinery Co., Ltd.
- Mechanical component and method for manufacturing mechanical component13 Aug 2026US 2026/0235197 A1Komatsu Ltd.
- Method for forming a face spline in a constant velocity joint6 Aug 2026US 2026/0225150 A1Hansae Mobility Co., Ltd.
- Quenching apparatus30 Jul 2026US 2026/0218324 A1Aisin Corporation
- Quenching apparatus30 Jul 2026US 2026/0218327 A1Aisin Corporation
- Method for producing a nitrided part of an aircraft turbomachine9 Jul 2026US 2026/0193767 A1Safran
Most cited
By later US patents
- Ultrasonic impact machining of body surfaces to correct defects and strengthen work surfaces72US 6,932,876 B1U.I.T., L.L.C. · 2005
- Method for hardening gears by induction heating56US 4,675,488 ATocco, Inc. · 1987
- Toothed wheel for use in automobiles and its manufacturing method42US 5,310,432 AKubota Iron Works Co., Ltd. · 1994
- Gear wheels rolled from powder metal blanks and method of manufacture31US 5,711,187 AFormflo Limited · 1998
- Method and apparatus for laser gear hardening30US 4,539,461 AThe Garrett Corporation · 1985