C21D 1/44
In heat-treatment baths
Official title: in heat-treatment baths
C21D1/44 (In heat-treatment baths) appears on 80 US grants and 45 published applications in this corpus.
Search patents in C21D- Granted patents
- 80
- Published applications
- 45
- Assignees
- 72
- Inventors
- 177
- Latest grant
- 23 Apr 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 5 | 0 |
| 1978 | 5 | 0 |
| 1979 | 8 | 0 |
| 1980 | 2 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 3 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 2 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 3 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 1 |
| 2002 | 1 | 0 |
| 2003 | 1 | 1 |
| 2004 | 2 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 0 |
| 2009 | 0 | 3 |
| 2010 | 0 | 4 |
| 2011 | 2 | 1 |
| 2012 | 1 | 0 |
| 2013 | 1 | 5 |
| 2014 | 0 | 0 |
| 2015 | 1 | 5 |
| 2016 | 2 | 3 |
| 2017 | 3 | 2 |
| 2018 | 0 | 2 |
| 2019 | 4 | 2 |
| 2020 | 2 | 2 |
| 2021 | 3 | 3 |
| 2022 | 2 | 2 |
| 2023 | 0 | 1 |
| 2024 | 1 | 3 |
| 2025 | 0 | 1 |
| 2026 | 0 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Metal back plate and manufacturing process thereof, backlight module and electronic device23 Apr 2024US 11,966,074 B2Beijing Xiaomi Mobile Software Co., Ltd.
- Method of manufacturing cam piece for continuously variable valve duration and cam piece manufactured therefrom13 Sep 2022US 11,441,204 B2Hyundai Motor Company
- Method for producing surface-hardened material17 May 2022US 11,332,818 B2Nihon Parkerizing Co., Ltd.
- Sliding member and method for producing same18 May 2021US 11,007,572 B2Ntn Corporation
- Apparatus for microtreatment of iron-based alloy30 Mar 2021US 10,961,598 B2
- Heat treatment methods for multiphase superalloys24 Sep 2026US 2026/0286454 A1General Electric Company
- Salt-bath heat treatment apparatus18 Jun 2026US 2026/0168044 A1Parker Netsushori Kogyo K.K.
- Roll formed steel component13 Nov 2025US 2025/0346982 A1GM Global Technology Operations LLC
- Heat- treated steel and heat treatment method for steel7 Nov 2024US 2024/0368718 A1Tokyo Rope Mfg. Co., Ltd.
- Wire rod and steel wire for spring, spring with improved strength and fatigue limit, and method for manufacturing same8 Aug 2024US 2024/0263286 A1Posco
Most cited
By later US patents
- Silent chain30US 6,068,568 ATsubakimoto Chain Co. · 2000
- Method of isothermal annealing of band steels for tools and razor blades15US 4,021,272 AHitachi Metals, Ltd. · 1977
- Method for heat treating and quenching complex metal components using salt baths13US 4,789,410 AUnited Technologies Corporation · 1988
- Treating waste discharge liquids from metal hardening baths, particularly containing nitrite and nitrate compounds7US 3,966,508 A1976
- Salt reclamation system7US 4,109,897 AAjax Electric Company · 1978