C21D 1/32
Soft annealing
Official title: Soft annealing, e.g. spheroidising
C21D1/32 (Soft annealing) appears on 148 US grants and 196 published applications in this corpus.
Search patents in C21D- Granted patents
- 148
- Published applications
- 196
- Assignees
- 97
- Inventors
- 531
- Latest grant
- 30 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 3 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 3 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 4 | 0 |
| 2000 | 3 | 0 |
| 2001 | 1 | 0 |
| 2002 | 3 | 3 |
| 2003 | 7 | 3 |
| 2004 | 2 | 4 |
| 2005 | 2 | 1 |
| 2006 | 1 | 1 |
| 2007 | 0 | 2 |
| 2008 | 2 | 4 |
| 2009 | 0 | 3 |
| 2010 | 1 | 8 |
| 2011 | 2 | 13 |
| 2012 | 7 | 6 |
| 2013 | 2 | 15 |
| 2014 | 5 | 7 |
| 2015 | 7 | 7 |
| 2016 | 4 | 11 |
| 2017 | 8 | 10 |
| 2018 | 6 | 9 |
| 2019 | 8 | 9 |
| 2020 | 3 | 12 |
| 2021 | 12 | 10 |
| 2022 | 8 | 11 |
| 2023 | 7 | 12 |
| 2024 | 7 | 25 |
| 2025 | 8 | 9 |
| 2026 | 6 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Austenitic stainless steel and tube30 Jun 2026US 12,668,862 B2Nippon Steel Corporation
- High toughness high carbon cold rolled steel sheet having excellent formability, and method for manufacturing same21 Apr 2026US 12,606,881 B2Posco
- Steel wire for machine structural parts and method for manufacturing the same7 Apr 2026US 12,595,527 B2Kobe Steel, Ltd.
- QT heat treated high carbon hot rolled steel sheet, high carbon cold rolled steel sheet, QT heat treated high carbon cold rolled steel sheet, and manufacturing methods thereof7 Apr 2026US 12,595,539 B2Posco
- High-carbon bearing steel and preparation method thereof27 Jan 2026US 12,534,771 B2Central Iron and Steel Research Institute
- Case-hardening steel9 Apr 2026US 2026/0098330 A1Daido Steel Co., Ltd.
- High-vanadium high-speed steel and preparation method therefor, and use thereof13 Nov 2025US 2025/0346971 A1Kunshan Micrograin Co., Ltd.
- High-toughness steel and method for manufacturing the same13 Nov 2025US 2025/0346972 A1China Steel Corporation
- Steel wire and method of manufacturing steel wire16 Oct 2025US 2025/0320589 A1Sumitomo Electric Industries, Ltd.
- Method and fixture for local softening of hot stamped member8 May 2025US 2025/0144692 A1
Most cited
By later US patents
- Golf club head and a method for producing the same26US 5,378,295 AYamaha Corporation · 1995
- Hi-density sintered alloy23US 5,516,483 AStackpole Limited · 1996
- Method of making a heat treated steel casting and a heat treated steel casting18US 5,900,082 ANACO, Inc. · 1999
- Divorced eutectoid transformation process and product of ultrahigh carbon steels16US 4,448,613 AThe Board of Trustees of the Leland Stanford Jr. University · 1984
- Bar or wire product for use in cold forging and method for producing the same14US 6,602,359 B1Nippon Steel Corporation · 2003