Method for producing a steel part and corresponding steel part
US-12454744-B2 · Oct 28, 2025 · US
by expanding tubular bodies
by expanding tubular bodies · Cooperative Patent Classification (CPC)
Chemical and metallurgical processes, compounds, and materials.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | C21D7/12 |
| Official title | by expanding tubular bodies |
| Display label | by expanding tubular bodies |
| Total patents | 46 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 5 |
| 2016 | 2 |
| 2018 | 7 |
| 2019 | 5 |
| 2020 | 3 |
| 2021 | 6 |
| 2022 | 5 |
| 2023 | 6 |
| 2024 | 3 |
| 2025 | 4 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Expanded tube for a motor vehicle crash box and manufacturing method for it
US-12391201-B2 · Aug 19, 2025 · US
Alloy
US-12378648-B2 · Aug 5, 2025 · US
Austenitic stainless steel material
US-2025197982-A1 · Jun 19, 2025 · US
Steel material for line pipes, method for producing the same, and method for producing line pipe
US-12037666-B2 · Jul 16, 2024 · US
Steel pipe for pressure piping and starting material for steel pipe
US-2024093324-A1 · Mar 21, 2024 · US
Steel material suitable for use in sour environment
US-11891680-B2 · Feb 6, 2024 · US
Multi-thickness welded vehicle structure
US-11761052-B2 · Sep 19, 2023 · US
Multi-thickness welded vehicle structure
US-2023183831-A1 · Jun 15, 2023 · US
Treatment process for a centrifugal compressor wheel to extend low-cycle fatigue life
US-2023158618-A1 · May 25, 2023 · US
Treatment process for a centrifugal compressor wheel to extend low-cycle fatigue life
US-11648632-B1 · May 16, 2023 · US
Steel pipe for pressure piping
US-2023140650-A1 · May 4, 2023 · US
Expanded tube for a motor vehicle crash box and manufacturing method for it
US-2023060627-A1 · Mar 2, 2023 · US
Alloy
US-2022380872-A1 · Dec 1, 2022 · US
Steel material for line pipes, method for producing the same, and method for producing line pipe
US-11401568-B2 · Aug 2, 2022 · US
Device and method for the autofrettage of a workpiece
US-11298737-B2 · Apr 12, 2022 · US
Steel material suitable for use in sour environment
US-2022098712-A1 · Mar 31, 2022 · US
Steel material suitable for use in sour environment
US-2022042148-A1 · Feb 10, 2022 · US
Steel pipe or tube for pressure vessels, method of producing steel pipe or tube for pressure vessels, and composite pressure vessel liner
US-11168375-B2 · Nov 9, 2021 · US
Device and method for strengthening thin-walled straight pipe
US-11141773-B1 · Oct 12, 2021 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C21D7/12?
- CPC C21D7/12 is the Cooperative Patent Classification code for “by expanding tubular bodies.”
- How many patents are filed under CPC C21D7/12 (by expanding tubular bodies)?
- Our database includes 46 publications tagged with this CPC code.
- Is patent activity under CPC C21D7/12 growing?
- Publication counts under this code: 3 in 2024 vs 4 in 2025 (latest complete years).