C23C 8/22
Of ferrous surfaces
Official title: of ferrous surfaces
C23C8/22 (Of ferrous surfaces) appears on 385 US grants and 433 published applications in this corpus.
Search patents in C23C- Granted patents
- 385
- Published applications
- 433
- Assignees
- 253
- Inventors
- 1,046
- Latest grant
- 2 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 6 | 0 |
| 1978 | 1 | 0 |
| 1979 | 6 | 0 |
| 1980 | 6 | 0 |
| 1981 | 3 | 0 |
| 1982 | 2 | 0 |
| 1983 | 3 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 4 | 0 |
| 1987 | 4 | 0 |
| 1988 | 2 | 0 |
| 1989 | 5 | 0 |
| 1990 | 4 | 0 |
| 1991 | 2 | 0 |
| 1992 | 4 | 0 |
| 1993 | 5 | 0 |
| 1994 | 1 | 0 |
| 1995 | 3 | 0 |
| 1996 | 5 | 0 |
| 1997 | 8 | 0 |
| 1998 | 5 | 0 |
| 1999 | 5 | 0 |
| 2000 | 6 | 0 |
| 2001 | 7 | 1 |
| 2002 | 4 | 6 |
| 2003 | 10 | 22 |
| 2004 | 3 | 15 |
| 2005 | 3 | 14 |
| 2006 | 9 | 21 |
| 2007 | 7 | 15 |
| 2008 | 10 | 20 |
| 2009 | 5 | 8 |
| 2010 | 7 | 12 |
| 2011 | 8 | 14 |
| 2012 | 12 | 26 |
| 2013 | 15 | 19 |
| 2014 | 11 | 18 |
| 2015 | 8 | 24 |
| 2016 | 24 | 37 |
| 2017 | 23 | 18 |
| 2018 | 14 | 21 |
| 2019 | 20 | 20 |
| 2020 | 20 | 19 |
| 2021 | 18 | 24 |
| 2022 | 11 | 19 |
| 2023 | 12 | 14 |
| 2024 | 15 | 7 |
| 2025 | 9 | 7 |
| 2026 | 4 | 12 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method for producing a screw, and screw2 Jun 2026US 12,644,162 B2EJOT GmbH & Co. KG
- Method and device for producing direct reduced metal7 Apr 2026US 12,595,521 B2Greeniron H2 AB
- Variable diffusion carburizing method17 Feb 2026US 12,553,118 B2GKN Sinter Metals, LLC
- Carburized bearing6 Jan 2026US 12,516,698 B2Jtekt Corporation
- Steel25 Nov 2025US 12,480,190 B2Jtekt Corporation
- Method for calculating carbon concentration distribution in pulse carburizing process20 Aug 2026US 2026/0242923 A1Beijing Research Institute of Mechanical & Electrical Technology Co., Ltd. Cam
- Ceramic coating13 Aug 2026US 2026/0234782 A1
- Mechanical component and method for manufacturing mechanical component13 Aug 2026US 2026/0235197 A1Komatsu Ltd.
- Vacuum carburizing furnace and vacuum carburizing treatment method21 May 2026US 2026/0139353 A1Dowa Thermotech Co., Ltd.
- Bushing with sleeve30 Apr 2026US 2026/0116482 A1Caterpillar Inc.
Most cited
By later US patents
- Thermal flux processing by scanning133US 6,987,240 B2APPLIED Materials.Inc. · 2006
- Thermal flux processing by scanning57US 7,005,601 B2APPLIED Materials.Inc. · 2006
- Carburized parts, method for producing same and carburizing system41US 6,258,179 B1Komatsu Ltd. · 2001
- Method of heat treating high carbon alloy steel parts to develop surface compressive residual stresses40US 4,191,599 AFord Motor Company · 1980
- Rolling bearing32US 5,030,017 ANippon Seiko Kabushiki Kaisha · 1991