C21D 9/08
Heat treatment: for tubular bodies or pipes
Official title: for tubular bodies or pipes
C21D9/08 (Heat treatment: for tubular bodies or pipes) appears on 957 US grants and 1,148 published applications in this corpus.
Search patents in C21D- Granted patents
- 957
- Published applications
- 1,148
- Assignees
- 480
- Inventors
- 2,281
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 6 | 0 |
| 1978 | 11 | 0 |
| 1979 | 6 | 0 |
| 1980 | 9 | 0 |
| 1981 | 5 | 0 |
| 1982 | 3 | 0 |
| 1983 | 8 | 0 |
| 1984 | 13 | 0 |
| 1985 | 9 | 0 |
| 1986 | 12 | 0 |
| 1987 | 3 | 0 |
| 1988 | 7 | 0 |
| 1989 | 15 | 0 |
| 1990 | 1 | 0 |
| 1991 | 15 | 0 |
| 1992 | 6 | 0 |
| 1993 | 8 | 0 |
| 1994 | 5 | 0 |
| 1995 | 10 | 0 |
| 1996 | 5 | 0 |
| 1997 | 5 | 0 |
| 1998 | 5 | 0 |
| 1999 | 4 | 0 |
| 2000 | 11 | 0 |
| 2001 | 11 | 1 |
| 2002 | 8 | 8 |
| 2003 | 5 | 9 |
| 2004 | 10 | 18 |
| 2005 | 9 | 16 |
| 2006 | 2 | 21 |
| 2007 | 6 | 19 |
| 2008 | 8 | 39 |
| 2009 | 15 | 50 |
| 2010 | 18 | 45 |
| 2011 | 24 | 45 |
| 2012 | 23 | 36 |
| 2013 | 32 | 41 |
| 2014 | 33 | 46 |
| 2015 | 28 | 64 |
| 2016 | 26 | 53 |
| 2017 | 46 | 69 |
| 2018 | 43 | 74 |
| 2019 | 68 | 87 |
| 2020 | 46 | 66 |
| 2021 | 67 | 66 |
| 2022 | 67 | 65 |
| 2023 | 38 | 58 |
| 2024 | 44 | 53 |
| 2025 | 56 | 53 |
| 2026 | 35 | 46 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- High-strength stainless steel seamless pipe for oil country tubular goods and method for manufacturing same22 Sep 2026US 12,742,221 B2Jfe Steel Corporation
- Method of forming and heat treating coiled tubing22 Sep 2026US 12,742,232 B2Tenaris Coiled Tubes, LLC
- Martensitic stainless steel seamless pipe15 Sep 2026US 12,735,779 B2Nippon Steel Corporation
- Tubular stabilizer bar for a vehicle chassis, and vehicle chassis comprising the tubular stabilizer bar1 Sep 2026US 12,722,444 B2thyssenkrupp AG
- Method for production of a steel tubular product, in particular an airbag tubular product, and a steel tubular product produced using this method, in particular an airbag tubular product11 Aug 2026US 12,703,021 B2Benteler Steel/Tube GmbH
- Production and preparation method of carburized gear shaft bars by means of converter process24 Sep 2026US 2026/0286458 A1Bengang Steel Plates Co., Ltd.
- High-strength stainless steel seamless pipe for oil wells24 Sep 2026US 2026/0286485 A1Jef Steel Corporation
- Ultra-high-strength hot-rolled steel sheet, steel pipe, member, and manufacturing methods therefor17 Sep 2026US 2026/0275439 A1Posco
- Steel material17 Sep 2026US 2026/0275472 A1Nippon Steel Corporation
- Steel material10 Sep 2026US 2026/0265888 A1Nippon Steel Corporation
Most cited
By later US patents
- Heat treatment with an autoregulating heater259US 4,623,401 AMetcal, Inc. · 1986
- Method of fine-machining a workpiece surface to be supplied with a lubricant during operation of the workpiece54US 5,630,953 AMaschinenfabrik Gehring GmbH & Co. · 1997
- Method of working metal, metal body obtained by the method and metal-containing ceramic body obtained by the method46US 7,559,221 B2Rinascimetalli Ltd. · 2009
- Metallic tubular structure having improved collapse strength and method of producing the same44US 4,825,674 ASumitomo Metal Industries, Ltd. · 1989
- Method for partially annealing the sidewall of a container41US 5,058,408 AAluminum Company of America · 1991