Steel for rails and a method of manufacturing of a rail thereof
US-2024002966-A1 · Jan 4, 2024 · US
Pearlite
Pearlite · 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 | C21D2211/009 |
| Official title | Pearlite |
| Display label | Pearlite |
| Total patents | 912 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 59 |
| 2016 | 51 |
| 2017 | 73 |
| 2018 | 72 |
| 2019 | 83 |
| 2020 | 84 |
| 2021 | 77 |
| 2022 | 98 |
| 2023 | 74 |
| 2024 | 102 |
| 2025 | 108 |
| 2026 | 31 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Nano-Pearlite Rail and Process for Manufacturing Same
US-2015368765-A1 · Dec 24, 2015 · US
Electric Resistance Welded Steel Pipe
US-2015368768-A1 · Dec 24, 2015 · US
Forced water cooling of thick steel wires
US-2015361536-A1 · Dec 17, 2015 · US
H-section steel and method of producing the same
US-2015361664-A1 · Dec 17, 2015 · US
Wire rod, steel wire, and manufacturing method thereof
US-9212405-B2 · Dec 15, 2015 · US
Steel rod and high strength steel wire having superior ductility and methods of production of same
US-9212410-B2 · Dec 15, 2015 · US
Steel sheet for soft-nitriding and method for manufacturing the same
US-2015354034-A1 · Dec 10, 2015 · US
Rolled steel bar or wire for hot forging
US-9200354-B2 · Dec 1, 2015 · US
Hot-rolled steel sheet having excellent cold formability and hardenability and method for manufacturing the same
US-9194017-B2 · Nov 24, 2015 · US
Hot-rolled steel sheet exhibiting excellent cold formability and excellent surface hardness after forming
US-2015329932-A1 · Nov 19, 2015 · US
Steel sheet and fabrication method thereof
US-2015314569-A1 · Nov 5, 2015 · US
Steel sheet pile and method for manufacturing the same
US-2015314345-A1 · Nov 5, 2015 · US
Rolled wire rod and manufacturing method thereof
US-9169530-B2 · Oct 27, 2015 · US
Steel sheet for soft-nitriding and method for manufacturing the same
US-2015299830-A1 · Oct 22, 2015 · US
Deformed steel wire for protection tube of submarine cable, method for manufacturing same, and pressure-resistant layer
US-2015301297-A1 · Oct 22, 2015 · US
Hot rolled steel sheet for square column for building structural members and method of manufacturing the same
US-2015292054-A1 · Oct 15, 2015 · US
Steel for machine structure use for surface hardening and steel part for machine structure use
US-9156231-B2 · Oct 13, 2015 · US
High-strength galvanized steel sheet having excellent formability and method for manufacturing the same
US-9157132-B2 · Oct 13, 2015 · US
High-carbon hot-rolled steel sheet, high-carbon cold-rolled steel sheet, and method of manufacturing the same
US-9133532-B2 · Sep 15, 2015 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C21D2211/009?
- CPC C21D2211/009 is the Cooperative Patent Classification code for “Pearlite.”
- How many patents are filed under CPC C21D2211/009 (Pearlite)?
- Our database includes 912 publications tagged with this CPC code.
- Is patent activity under CPC C21D2211/009 growing?
- Publication counts under this code: 102 in 2024 vs 108 in 2025 (latest complete years).