Steel for rails and a method of manufacturing of a rail thereof
US-2024002966-A1 · Jan 4, 2024 · US
for rails
for rails · 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 | C21D9/04 |
| Official title | for rails |
| Display label | for rails |
| Total patents | 113 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 11 |
| 2016 | 6 |
| 2017 | 12 |
| 2018 | 14 |
| 2019 | 11 |
| 2020 | 15 |
| 2021 | 11 |
| 2022 | 11 |
| 2023 | 5 |
| 2024 | 4 |
| 2025 | 12 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Track link for a track joint assembly having wear band with lengthwise-varied hardness
US-10870455-B2 · Dec 22, 2020 · US
Onsite steel rail laser processing engineering vehicle
US-10808364-B2 · Oct 20, 2020 · US
A coated steel substrate
US-2020318213-A1 · Oct 8, 2020 · US
Friction apparatus
US-10662588-B2 · May 26, 2020 · US
Heat treatment device, heat treatment method, and rail steel
US-10544479-B2 · Jan 28, 2020 · US
Alloyed al plated steel sheet for hot stamping and hot stamped steel member
US-2019366686-A1 · Dec 5, 2019 · US
Rail
US-10494704-B2 · Dec 3, 2019 · US
Head hardened rail manufacturing method and manufacturing apparatus
US-10472693-B2 · Nov 12, 2019 · US
Method for selecting rail steel and wheel steel
US-2019249280-A1 · Aug 15, 2019 · US
7000 Series Aluminum Alloy Ladder, Multipurpose Ladder and Method
US-2019234144-A1 · Aug 1, 2019 · US
Onsite steel rail laser processing engineering vehicle
US-2019161918-A1 · May 30, 2019 · US
Rail
US-2019161839-A1 · May 30, 2019 · US
Rail manufacturing method and manufacturing equipment
US-2019106762-A1 · Apr 11, 2019 · US
Pearlitic rail and method for manufacturing pearlitic rail
US-10253397-B2 · Apr 9, 2019 · US
Rail and production method therefor
US-10233512-B2 · Mar 19, 2019 · US
Rail manufacturing method and manufacturing equipment
US-10214795-B2 · Feb 26, 2019 · US
Method of reheating rail weld zone
US-10144983-B2 · Dec 4, 2018 · US
Method of producing steel material, apparatus that cools steel material, and steel material
US-2018327880-A1 · Nov 15, 2018 · US
Nano-pearlite rail and process for manufacturing same
US-10113219-B2 · Oct 30, 2018 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C21D9/04?
- CPC C21D9/04 is the Cooperative Patent Classification code for “for rails.”
- How many patents are filed under CPC C21D9/04 (for rails)?
- Our database includes 113 publications tagged with this CPC code.
- Is patent activity under CPC C21D9/04 growing?
- Publication counts under this code: 4 in 2024 vs 12 in 2025 (latest complete years).