Steel for rails and a method of manufacturing of a rail thereof
US-2024002966-A1 · Jan 4, 2024 · US
Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment (hardening articles or materials formed by forging or rolling with no further heating beyond that required for the formation C21D1/02)
Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment (hardening articles or materials formed by forging or rolling with no further heating beyond that required for the formation C21D1/02) · 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 | C21D8/00 |
| Official title | Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment (hardening articles or materials formed by forging or rolling with no further heating beyond that required for the formation C21D1/02) |
| Display label | Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment (hardening articles or materials formed by forging or rolling with no further heating beyond that required for the formation C21D1/02) |
| Total patents | 1,266 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 71 |
| 2016 | 79 |
| 2017 | 96 |
| 2018 | 101 |
| 2019 | 109 |
| 2020 | 98 |
| 2021 | 115 |
| 2022 | 163 |
| 2023 | 125 |
| 2024 | 136 |
| 2025 | 146 |
| 2026 | 27 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Air-hardenable bainitic steel with enhanced material characteristics
US-2015376750-A1 · Dec 31, 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
A 780mpa cold-rolled duel-phase strip steel and method for manufacturing the same
US-2015361519-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
High-manganese wear resistant steel having excellent weldability and method for manufacturing same
US-2015322551-A1 · Nov 12, 2015 · US
Creep resistant high temperature martensitic steel
US-9181597-B1 · Nov 10, 2015 · US
Stainless steel for oil well, stainless steel pipe for oil well, and method of manufacturing stainless steel for oil well
US-2015307972-A1 · Oct 29, 2015 · US
Method for treating a cast iron workpiece and workpiece formed thereby
US-2015292053-A1 · Oct 15, 2015 · US
Ferritic stainless steel and method for manufacturing the same
US-2015275342-A1 · Oct 1, 2015 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C21D8/00?
- CPC C21D8/00 is the Cooperative Patent Classification code for “Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment (hardening articles or materials formed by forging or rolling with no further heating beyond that required for the formation C21D1/02).”
- How many patents are filed under CPC C21D8/00 (Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment (hardening articles or materials formed by forging or rolling with no further heating beyond that required for the formation C21D1/02))?
- Our database includes 1,266 publications tagged with this CPC code.
- Is patent activity under CPC C21D8/00 growing?
- Publication counts under this code: 136 in 2024 vs 146 in 2025 (latest complete years).