Apparatus and method for nitriding grain-oriented electrical steel sheet
US-10066286-B2 · Sep 4, 2018 · US
by direct application of electrical or wave energy; by particle radiation
by direct application of electrical or wave energy; by particle radiation · 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 | C21D1/09 |
| Official title | by direct application of electrical or wave energy; by particle radiation |
| Display label | by direct application of electrical or wave energy; by particle radiation |
| Total patents | 182 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2015 | 19 |
| 2016 | 19 |
| 2017 | 18 |
| 2018 | 17 |
| 2019 | 19 |
| 2020 | 21 |
| 2021 | 20 |
| 2022 | 15 |
| 2023 | 15 |
| 2024 | 10 |
| 2025 | 8 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
System for conditioning material using a laser and method thereof
US-2018187281-A1 · Jul 5, 2018 · US
Grain-oriented electrical steel sheet
US-2018071869-A1 · Mar 15, 2018 · US
Grain-oriented electrical steel sheet
US-2018036838-A1 · Feb 8, 2018 · US
Method for producing a sliding surface on a machine element
US-2017348797-A1 · Dec 7, 2017 · US
Process for obtaining a piston ring and internal combustion engine
US-2017327918-A1 · Nov 16, 2017 · US
Turbine rotor
US-9797256-B2 · Oct 24, 2017 · US
Surface layer hardened metal material and surface layer hardening method
US-9777363-B2 · Oct 3, 2017 · US
Method for improving fatigue strength
US-2017239744-A1 · Aug 24, 2017 · US
Method of treatment, turbine component, and turbine system
US-2017240985-A1 · Aug 24, 2017 · US
Laser hardened crankshaft
US-2017198368-A1 · Jul 13, 2017 · US
In-process laser hardening/forming of vehicle seat structures and components
US-2017182918-A1 · Jun 29, 2017 · US
Laser processing apparatus
US-2017157706-A1 · Jun 8, 2017 · US
Method for laser heat treatment to improve formability of advanced high strength steels
US-9670560-B2 · Jun 6, 2017 · US
Laser-based marking method and apparatus
US-9636776-B2 · May 2, 2017 · US
Femtosecond laser pulse surface structuring methods and materials resulting therefrom
US-2017100797-A1 · Apr 13, 2017 · US
Laser processing apparatus and laser irradiation method
US-9607744-B2 · Mar 28, 2017 · US
Partially hardened rotary tool and corresponding production method
US-2017072477-A1 · Mar 16, 2017 · US
Laser Shock Peening Method for Obtaining Large-Area Uniform Surface Morphology
US-2017050265-A1 · Feb 23, 2017 · US
Grain-oriented electrical steel sheet for low-noise transformer, and method of manufacturing said sheet
US-2017016085-A1 · Jan 19, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C21D1/09?
- CPC C21D1/09 is the Cooperative Patent Classification code for “by direct application of electrical or wave energy; by particle radiation.”
- How many patents are filed under CPC C21D1/09 (by direct application of electrical or wave energy; by particle radiation)?
- Our database includes 182 publications tagged with this CPC code.
- Is patent activity under CPC C21D1/09 growing?
- Publication counts under this code: 10 in 2024 vs 8 in 2025 (latest complete years).