C21C 5/005
Manufacture of stainless steel
Official title: {Manufacture of stainless steel}
C21C5/005 (Manufacture of stainless steel) appears on 110 US grants and 65 published applications in this corpus.
Search patents in C21C- Granted patents
- 110
- Published applications
- 65
- Assignees
- 71
- Inventors
- 314
- Latest grant
- 16 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 6 | 0 |
| 1984 | 5 | 0 |
| 1985 | 8 | 0 |
| 1986 | 2 | 0 |
| 1987 | 1 | 0 |
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 6 | 0 |
| 1991 | 6 | 0 |
| 1992 | 2 | 0 |
| 1993 | 2 | 0 |
| 1994 | 3 | 0 |
| 1995 | 2 | 0 |
| 1996 | 3 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 0 |
| 2002 | 2 | 1 |
| 2003 | 2 | 2 |
| 2004 | 7 | 5 |
| 2005 | 0 | 1 |
| 2006 | 1 | 2 |
| 2007 | 2 | 3 |
| 2008 | 0 | 1 |
| 2009 | 1 | 3 |
| 2010 | 2 | 4 |
| 2011 | 1 | 2 |
| 2012 | 3 | 3 |
| 2013 | 2 | 1 |
| 2014 | 3 | 3 |
| 2015 | 0 | 3 |
| 2016 | 1 | 1 |
| 2017 | 2 | 1 |
| 2018 | 1 | 1 |
| 2019 | 0 | 1 |
| 2020 | 0 | 1 |
| 2021 | 1 | 1 |
| 2022 | 0 | 4 |
| 2023 | 2 | 11 |
| 2024 | 3 | 3 |
| 2025 | 4 | 5 |
| 2026 | 3 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method for producing chromium-containing molten steel16 Jun 2026US 12,655,488 B2Jfe Steel Corporation
- Method for preparing stainless steel seamless tube with ultra-high cleanliness for integrated circuit and IC industry preparation device, and stainless steel seamless tube14 Apr 2026US 12,601,026 B2Shengtak New Materials Co., Ltd
- Stainless steel with good mirror polishability and method for producing same17 Feb 2026US 12,553,115 B2Nippon Steel Stainless Steel Corporation
- Dual-phase stainless steel and dual-phase stainless steel seamless pipe30 Dec 2025US 12,509,752 B2Jfe Steel Corporation
- Fe—Ni—Cr alloy having superior corrosion resistance, weldability, and oxidation resistance30 Dec 2025US 12,509,753 B2Nippon Yakin Kogyo Co., Ltd.
- Method for manufacturing high-chromium (cr) molten steel, method for manufacturing cast piece, and method for manufacturing press roll16 Apr 2026US 2026/0103769 A1Posco
- Method for producing and preparing steel bar for automotive bushings by means of ecological and economical arc furnace5 Feb 2026US 2026/0035775 A1Bengang Steel Plates Co., Ltd.
- Methods for Improved Carbon Endpoint Determination25 Dec 2025US 2025/0388987 A1
- Martensitic stainless steel material24 Jul 2025US 2025/0236939 A1Nippon Steel Corporation
- Martensitic stainless steel material8 May 2025US 2025/0146112 A1Nippon Steel Corporation
Most cited
By later US patents
- Method of reducing metal oxide in a rotary hearth furnace heated by an oxidizing flame31US 5,567,224 AArmco Inc. · 1996
- Process for producing stainless steels26US 4,178,173 AFried. Krupp Huttenwerke AG · 1979
- Steelmaking process13US 6,273,973 B1ATI Properties, Inc. · 2001
- Metallurgical processes9US 4,575,394 A1986
- Tuyere for blowing gases into molten metal bath container8US 4,417,723 AKabushiki Kaisha Kobe Seiko Sho · 1983