C21D 9/36
Heat treatment: for balls
Official title: for balls; for rollers
C21D9/36 (Heat treatment: for balls) appears on 92 US grants and 93 published applications in this corpus.
Search patents in C21D- Granted patents
- 92
- Published applications
- 93
- Assignees
- 54
- Inventors
- 261
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 3 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 5 | 0 |
| 2000 | 6 | 0 |
| 2001 | 4 | 0 |
| 2002 | 4 | 2 |
| 2003 | 3 | 2 |
| 2004 | 2 | 5 |
| 2005 | 2 | 4 |
| 2006 | 1 | 1 |
| 2007 | 2 | 2 |
| 2008 | 2 | 5 |
| 2009 | 1 | 1 |
| 2010 | 2 | 6 |
| 2011 | 2 | 2 |
| 2012 | 3 | 3 |
| 2013 | 3 | 2 |
| 2014 | 0 | 9 |
| 2015 | 4 | 7 |
| 2016 | 1 | 10 |
| 2017 | 5 | 6 |
| 2018 | 6 | 2 |
| 2019 | 4 | 5 |
| 2020 | 3 | 4 |
| 2021 | 1 | 0 |
| 2022 | 1 | 3 |
| 2023 | 1 | 2 |
| 2024 | 1 | 4 |
| 2025 | 0 | 2 |
| 2026 | 5 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Forged steel roll for cold rolling6 Oct 2026US 12,752,325 B2Nippon Steel Corporation
- Method of heat treating a steel component18 Aug 2026US 12,709,781 B2Aktiebolaget Skf
- Forged grinding balls for semi-autogenous grinder16 Jun 2026US 12,655,493 B2Magotteaux International S.A.
- Method for producing a rolling bearing component10 Feb 2026US 12,546,361 B2Schaeffler Technologies AG & Co. KG
- Method of heat treating a steel component27 Jan 2026US 12,534,793 B2Aktiebolaget Skf
- Laser hardening installation for laser hardening a bearing component3 Sep 2026US 2026/0257300 A1
- Method for forming a face spline in a constant velocity joint6 Aug 2026US 2026/0225150 A1Hansae Mobility Co., Ltd.
- Method for producing a rolling bearing component21 May 2026US 2026/0139708 A1Schaeffler Technologies AG & Co. KG
- Rolling Bearing and Rolling Element Production Method5 Mar 2026US 2026/0063171 A1Nsk Ltd.
- Method of manufacturing spherical metal articles17 Apr 2025US 2025/0122588 A1Obshchestvo S Ogranichennoy Otvetstvennostyu "Npp Sistema 48"
Most cited
By later US patents
- Ball-and-roller bearing41US 5,338,377 ANsk Ltd. · 1994
- Rolling contact bearing and a method of producing thereof33US 5,658,082 ANtn Corporation · 1997
- Rolling bearing29US 5,137,375 ANippon Seiko Kabushiki Kaisha · 1992
- Rolling element and producing method29US 6,309,475 B1Komatsu Ltd. · 2001
- Method of manufacturing push rod balls28US 5,996,226 AITT Manufacturing Enterprises, Inc. · 1999