Steel for rails and a method of manufacturing of a rail thereof
US-2024002966-A1 · Jan 4, 2024 · US
Hardening articles or materials formed by forging or rolling, with no further heating beyond that required for the formation
Hardening articles or materials formed by forging or rolling, with no further heating beyond that required for the formation · 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 | C21D1/02 |
| Official title | Hardening articles or materials formed by forging or rolling, with no further heating beyond that required for the formation |
| Display label | Hardening articles or materials formed by forging or rolling, with no further heating beyond that required for the formation |
| Total patents | 306 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly growing.
| Year | Patents |
|---|---|
| 2015 | 2 |
| 2016 | 5 |
| 2017 | 6 |
| 2018 | 7 |
| 2019 | 5 |
| 2020 | 12 |
| 2021 | 15 |
| 2022 | 59 |
| 2023 | 61 |
| 2024 | 49 |
| 2025 | 58 |
| 2026 | 27 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Hot-rolled steel plate/strip for sulfuric acid dew point corrosion resistance and manufacturing method therefor
US-2022340993-A1 · Oct 27, 2022 · US
Thin steel plate having excellent low-temperature toughness and ctod properties, and method for manufacturing same
US-2022282352-A1 · Sep 8, 2022 · US
Steel sheet
US-2022267874-A1 · Aug 25, 2022 · US
Ultra-high strength steel sheet having excellent shear workability and method for manufacturing same
US-2022186335-A1 · Jun 16, 2022 · US
Method for manufacturing of stainless steel strips
US-2022177989-A1 · Jun 9, 2022 · US
High-strength steel sheet having excellent ductility and low-temperature toughness and method for manufacturing thereof
US-2022042132-A1 · Feb 10, 2022 · US
Martensitic stainless seamless steel pipe
US-2022033943-A1 · Feb 3, 2022 · US
Steel material having low yield ratio and excellent heat affected zone toughness and manufacturing method therefor
US-2021404031-A1 · Dec 30, 2021 · US
Hot-rolled steel sheet and method for manufacturing same
US-2021395852-A1 · Dec 23, 2021 · US
High strength steel plate for structure with good seawater corrosion resistant property and method of manufacturing same
US-2021388458-A1 · Dec 16, 2021 · US
Hot-rolled steel sheet
US-2021381086-A1 · Dec 9, 2021 · US
Martensitic stainless seamless steel pipe
US-2021317556-A1 · Oct 14, 2021 · US
Electric resistance welded steel pipe or tube
US-2021310091-A1 · Oct 7, 2021 · US
Process and device for cooling a metal substrate
US-11072839-B2 · Jul 27, 2021 · US
High-strength hot rolled steel sheet and method for manufacturing same
US-2021140007-A1 · May 13, 2021 · US
Ultrahigh-Strength Ultrahigh-Toughness and Low-Density Dual-Phase Lamellar Steel Plate and Preparation Method Therefor
US-2021108279-A1 · Apr 15, 2021 · US
High-strength steel with yield strength of 800 MPa and production method therefor
US-10961611-B2 · Mar 30, 2021 · US
Hot-rolled steel sheet having excellent expandability and method for manufacturing same
US-2021087647-A1 · Mar 25, 2021 · US
Steel material for line pipes, method for producing the same, and method for producing line pipe
US-2021054471-A1 · Feb 25, 2021 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C21D1/02?
- CPC C21D1/02 is the Cooperative Patent Classification code for “Hardening articles or materials formed by forging or rolling, with no further heating beyond that required for the formation.”
- How many patents are filed under CPC C21D1/02 (Hardening articles or materials formed by forging or rolling, with no further heating beyond that required for the formation)?
- Our database includes 306 publications tagged with this CPC code.
- Is patent activity under CPC C21D1/02 growing?
- Publication counts under this code: 49 in 2024 vs 58 in 2025 (latest complete years).