Steel material with good fatigue property in hydrogen and method for producing the same, and steel pipe and method for producing the same
US-2026098329-A1 · Apr 9, 2026 · US
Extraction of hydrogen
Extraction of hydrogen · 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 | C21D3/06 |
| Official title | Extraction of hydrogen |
| Display label | Extraction of hydrogen |
| Total patents | 60 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly growing.
| Year | Patents |
|---|---|
| 2016 | 5 |
| 2017 | 7 |
| 2018 | 5 |
| 2019 | 5 |
| 2020 | 3 |
| 2021 | 3 |
| 2022 | 3 |
| 2023 | 7 |
| 2024 | 8 |
| 2025 | 10 |
| 2026 | 4 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Continuous annealing line, continuous hot-dip galvanizing line, and steel sheet production method
US-12571068-B2 · Mar 10, 2026 · US
Austenitic stainless steel
US-2026055494-A1 · Feb 26, 2026 · US
High-strength galvanized steel sheet and method for manufacturing the same
US-12529131-B2 · Jan 20, 2026 · US
High-strength steel sheet and method for manufacturing same
US-12435384-B2 · Oct 7, 2025 · US
Methods for modifying surface properties using exothermic reactive powder mixtures
US-12428688-B2 · Sep 30, 2025 · US
High strength steel sheet and method for manufacturing the same
US-12378624-B2 · Aug 5, 2025 · US
Hot-stamped component having high cold-bending performance and high strength, and manufacturing method therefor
US-2025215519-A1 · Jul 3, 2025 · US
Dehydrogenation apparatus, steel sheet production system, and method of producing steel sheet
US-2025179622-A1 · Jun 5, 2025 · US
Continuous annealing line, continuous hot-dip galvanizing line, and method of producing steel sheet
US-2025171872-A1 · May 29, 2025 · US
Steel sheet, member, and method for producing them
US-12297515-B2 · May 13, 2025 · US
High-strength steel sheet and method for producing same
US-12258646-B2 · Mar 25, 2025 · US
Method for manufacturing an annealed steel sheet
US-2025034674-A1 · Jan 30, 2025 · US
Method for evaluating the hydrogen content in a steel sheet
US-2025035607-A1 · Jan 30, 2025 · US
Continuous annealing line, continuous hot-dip galvanizing line, and steel sheet production method
US-2024425959-A1 · Dec 26, 2024 · US
Steel sheet and method for producing same
US-12173380-B2 · Dec 24, 2024 · US
Dehydrogenation apparatus, steel sheet production system, and steel sheet production method
US-2024352549-A1 · Oct 24, 2024 · US
Apparatus and method for metallurgical heat-treatment
US-2024280322-A1 · Aug 22, 2024 · US
Clad steel plate, member, and production methods for same
US-2024158884-A1 · May 16, 2024 · US
Clad steel plate, member, and production methods for same
US-2024150876-A1 · May 9, 2024 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C21D3/06?
- CPC C21D3/06 is the Cooperative Patent Classification code for “Extraction of hydrogen.”
- How many patents are filed under CPC C21D3/06 (Extraction of hydrogen)?
- Our database includes 60 publications tagged with this CPC code.
- Is patent activity under CPC C21D3/06 growing?
- Publication counts under this code: 8 in 2024 vs 10 in 2025 (latest complete years).