C21D 9/50
Heat treatment: for welded joints
Official title: for welded joints
C21D9/50 (Heat treatment: for welded joints) appears on 583 US grants and 684 published applications in this corpus.
Search patents in C21D- Granted patents
- 583
- Published applications
- 684
- Assignees
- 357
- Inventors
- 1,794
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 3 | 0 |
| 1978 | 5 | 0 |
| 1979 | 4 | 0 |
| 1980 | 2 | 0 |
| 1981 | 3 | 0 |
| 1982 | 4 | 0 |
| 1983 | 3 | 0 |
| 1984 | 4 | 0 |
| 1985 | 3 | 0 |
| 1986 | 10 | 0 |
| 1987 | 4 | 0 |
| 1988 | 7 | 0 |
| 1989 | 7 | 0 |
| 1990 | 3 | 0 |
| 1991 | 3 | 0 |
| 1992 | 1 | 0 |
| 1993 | 6 | 0 |
| 1994 | 2 | 0 |
| 1995 | 4 | 0 |
| 1996 | 3 | 0 |
| 1997 | 7 | 0 |
| 1998 | 7 | 0 |
| 1999 | 1 | 0 |
| 2000 | 7 | 0 |
| 2001 | 4 | 0 |
| 2002 | 6 | 6 |
| 2003 | 6 | 8 |
| 2004 | 6 | 9 |
| 2005 | 9 | 12 |
| 2006 | 3 | 14 |
| 2007 | 4 | 13 |
| 2008 | 6 | 22 |
| 2009 | 7 | 29 |
| 2010 | 15 | 31 |
| 2011 | 23 | 23 |
| 2012 | 14 | 41 |
| 2013 | 20 | 20 |
| 2014 | 21 | 31 |
| 2015 | 17 | 46 |
| 2016 | 20 | 51 |
| 2017 | 32 | 40 |
| 2018 | 20 | 37 |
| 2019 | 36 | 55 |
| 2020 | 43 | 39 |
| 2021 | 26 | 47 |
| 2022 | 39 | 31 |
| 2023 | 26 | 26 |
| 2024 | 30 | 23 |
| 2025 | 28 | 20 |
| 2026 | 14 | 10 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Welded rail29 Sep 2026US 12,747,483 B2Nippon Steel Corporation
- Extremely thick steel plate for steam drum having excellent surface quality and lamellar tear resistance, and manufacturing method for same25 Aug 2026US 12,716,106 B2Posco
- Hot-stretch-reduced electric resistance welded pipe4 Aug 2026US 12,698,543 B2Nippon Steel Corporation
- Nickel-based alloy for manufacturing pipeline tubes16 Jun 2026US 12,655,501 B2Aperam
- Steel material having low surface hardness and excellent low temperature impact toughness, and method for manufacturing same9 Jun 2026US 12,649,966 B2Posco
- Hot-stamped product and method of producing the same27 Aug 2026US 2026/0249343 A1Nippon Steel Corporation
- A method to produce press hardened parts at high productivity6 Aug 2026US 2026/0226571 A1
- Nickel-containing steel welded joint for low temperature use30 Jul 2026US 2026/0216831 A1Nippon Steel Corporation
- Electric resistance welded steel pipes and line pipes30 Jul 2026US 2026/0218351 A1Jfe Steel Corporation
- Method for increasing hardened layer thickness of a rail head of a flash welded joint of a steel rail and a steel rail16 Jul 2026US 2026/0200019 A1Chengdu Advanced Metal Materials Industry Technology Research Institute Co., Ltd.
Most cited
By later US patents
- Seam-welded metal pipe and method of making the same without seam anneal115US 7,032,809 B1Steel Ventures, L.L.C. · 2006
- Method for developing residual compressive stress in stainless steel and nickel base superalloys81US 5,710,405 AGeneral Electrical Company · 1998
- Stress corrosion crack repair by plasma arc welding underwater welding81US 5,719,369 AGeneral Electric Company · 1998
- Ultrasonic impact methods for treatment of welded structures76US 6,338,765 B12002
- Ultrasonic impact machining of body surfaces to correct defects and strengthen work surfaces72US 6,932,876 B1U.I.T., L.L.C. · 2005