C23C 8/18
Oxidising of ferrous surfaces
C23C8/18 (Oxidising of ferrous surfaces) appears on 138 US grants and 118 published applications in this corpus.
Search patents in C23C- Granted patents
- 138
- Published applications
- 118
- Assignees
- 105
- Inventors
- 385
- Latest grant
- 2 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 2 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 3 | 0 |
| 1988 | 1 | 0 |
| 1989 | 3 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 5 | 0 |
| 1995 | 0 | 0 |
| 1996 | 3 | 0 |
| 1997 | 2 | 0 |
| 1998 | 4 | 0 |
| 1999 | 6 | 0 |
| 2000 | 7 | 0 |
| 2001 | 6 | 0 |
| 2002 | 3 | 2 |
| 2003 | 6 | 3 |
| 2004 | 2 | 4 |
| 2005 | 3 | 4 |
| 2006 | 2 | 5 |
| 2007 | 1 | 0 |
| 2008 | 1 | 0 |
| 2009 | 1 | 2 |
| 2010 | 1 | 0 |
| 2011 | 0 | 1 |
| 2012 | 2 | 5 |
| 2013 | 1 | 5 |
| 2014 | 1 | 3 |
| 2015 | 3 | 7 |
| 2016 | 4 | 13 |
| 2017 | 11 | 5 |
| 2018 | 7 | 10 |
| 2019 | 3 | 7 |
| 2020 | 5 | 7 |
| 2021 | 7 | 4 |
| 2022 | 3 | 11 |
| 2023 | 3 | 5 |
| 2024 | 11 | 6 |
| 2025 | 4 | 5 |
| 2026 | 2 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Anti-coking iron spinel surface2 Jun 2026US 12,644,173 B2NOVA Chemicals (International) S.A.
- Calculation method for thickness of inner oxide layer of martensitic heat-resistant steel in steam environment7 Apr 2026US 12,596,003 B2
- Oriented electrical steel sheet and method for manufacturing same2 Sep 2025US 12,404,562 B2Posco
- Cam ring and plate module for vehicle vacuum pumps, and method of manufacturing the same27 May 2025US 12,312,664 B2Hyundai Motor Company
- System and method of making an enhanced brake rotor with improved corrosion resistance27 May 2025US 12,313,134 B2GM Global Technology Operations LLC
- Surface treatment method, stainless steel component, x-ray tube, x-ray tube device, manufacturing method of stainless steel component, and manufacturing method of x-ray tube10 Sep 2026US 2026/0269166 A1FUJIFILM Corporation
- Ceramic coating13 Aug 2026US 2026/0234782 A1
- Oxidized and boronized layers for corrosion resistance4 Jun 2026US 2026/0152838 A1GM Global Technology Operations LLC
- Steel treatment method and electrical steel sheet12 Mar 2026US 2026/0071305 A1Aisin Corporation
- Austenitic fe-ni-cr alloy having excellent oxidation resistance and method for producing same16 Oct 2025US 2025/0320593 A1Nippon Yakin Kogyo Co., Ltd.
Most cited
By later US patents
- Combination of cylinder liner and piston ring of internal combustion engine30US 6,553,957 B1Hino Motors, Ltd. · 2003
- Method of reducing radioactivity in nuclear plant25US 4,820,473 AHitachi, Ltd. · 1989
- Surface on a stainless steel matrix23US 6,824,883 B1NOVA Chemicals (International) S.A. · 2004
- Surface treatment of metals18US 4,017,336 AExxon Reseaarch and Engineeering Company · 1977
- Process for making an oxide-layer18US 4,035,200 ASmit Ovens Nijmegen B.V. · 1977