Steel for rails and a method of manufacturing of a rail thereof
US-2024002966-A1 · Jan 4, 2024 · US
Chemistry & Metallurgy
Chemistry & Metallurgy · 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 | C21D8/005 |
| Official title | — |
| Display label | Chemistry & Metallurgy (mapped technology topic) |
| Total patents | 654 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 54 |
| 2016 | 51 |
| 2017 | 66 |
| 2018 | 59 |
| 2019 | 66 |
| 2020 | 62 |
| 2021 | 67 |
| 2022 | 84 |
| 2023 | 41 |
| 2024 | 52 |
| 2025 | 45 |
| 2026 | 7 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Alloy steel for high toughness constant velocity joint outer wheel and method of manufacturing the same
US-2016369363-A1 · Dec 22, 2016 · US
Air-hardenable bainitic steel part
US-9440693-B2 · Sep 13, 2016 · US
Controlling Liquid Metal Embrittlement In Galvanized Press-Hardened Components
US-2016145731-A1 · May 26, 2016 · US
Producing a product from a flexible rolled strip material
US-2016122889-A1 · May 5, 2016 · US
Method of production rare-earth magnet
US-2016055968-A1 · Feb 25, 2016 · US
Air-hardenable bainitic steel with enhanced material characteristics
US-2015376750-A1 · Dec 31, 2015 · US
Nano-Pearlite Rail and Process for Manufacturing Same
US-2015368765-A1 · Dec 24, 2015 · US
Device and method for hot stamping
US-2015367396-A1 · Dec 24, 2015 · US
Hot stamping product with enhanced toughness and method for manufacturing the same
US-2015361532-A1 · Dec 17, 2015 · US
H-section steel and method of producing the same
US-2015361664-A1 · Dec 17, 2015 · US
High strength austenitic-based steel with remarkable toughness of welding heat-affected zone and preparation method therefor
US-2015354037-A1 · Dec 10, 2015 · US
Manufacturing method for hot press formed steel member
US-2015354035-A1 · Dec 10, 2015 · US
Forged component, method for manufacturing the same, and connecting rod
US-2015354042-A1 · Dec 10, 2015 · US
Heat treatment apparatus for hot stamping and forming method using the same
US-2015344986-A1 · Dec 3, 2015 · US
Ferritic Stainless Steel for Automotive Exhaust System, Which Have Excellent Corrosion Resistance Against Condensate, Moldability, and High-Temperature Oxidation Resistance, and Method for Manufacturing Same
US-2015345361-A1 · Dec 3, 2015 · US
Hot-rolled steel sheet and manufacturing method thereof
US-9200342-B2 · Dec 1, 2015 · US
Method for producing steel material for friction welding
US-9194033-B2 · Nov 24, 2015 · US
Thermomechanical processing of high strength non-magnetic corrosion resistant material
US-9192981-B2 · Nov 24, 2015 · US
Steel part for machine structural use and manufacturing method thereof
US-9187797-B2 · Nov 17, 2015 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C21D8/005?
- CPC C21D8/005 is the Cooperative Patent Classification code for “Chemistry & Metallurgy.”
- How many patents are filed under CPC C21D8/005 (Chemistry & Metallurgy)?
- Our database includes 654 publications tagged with this CPC code.
- Is patent activity under CPC C21D8/005 growing?
- Publication counts under this code: 52 in 2024 vs 45 in 2025 (latest complete years).