Method for producing grain oriented electrical steel sheet
US-12359274-B2 · Jul 15, 2025 · US
during chemical change of surfaces
during chemical change of surfaces · 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 | C21D1/72 |
| Official title | during chemical change of surfaces |
| Display label | during chemical change of surfaces |
| Total patents | 39 |
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 | 4 |
| 2016 | 3 |
| 2017 | 6 |
| 2018 | 3 |
| 2019 | 3 |
| 2020 | 2 |
| 2021 | 3 |
| 2022 | 6 |
| 2023 | 3 |
| 2024 | 5 |
| 2025 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Annealing separator for grain-oriented electrical steel sheet and method of producing grain-oriented electrical steel sheet
US-12104216-B2 · Oct 1, 2024 · US
Method for producing an oxidation protection coating at least in regions on a component of a thermal gas turbine
US-2024287634-A1 · Aug 29, 2024 · US
Fabrication method for a component having magnetic and non-magnetic dual phases
US-11926880-B2 · Mar 12, 2024 · US
Annealing separator for grain-oriented electrical steel sheet and method of producing grain-oriented electrical steel sheet
US-11926888-B2 · Mar 12, 2024 · US
Protective surface on stainless steel
US-11859291-B2 · Jan 2, 2024 · US
Ni-based alloy material
US-2023340644-A1 · Oct 26, 2023 · US
Annealing separator for oriented electrical steel sheet, oriented electrical steel sheet, and manufacturing method of oriented electrical steel sheet
US-2023042915-A1 · Feb 9, 2023 · US
Grain-oriented electrical steel sheet and method for manufacturing same
US-11566302-B2 · Jan 31, 2023 · US
Annealing separator for oriented electrical steel sheet, oriented electrical steel sheet, and manufacturing method of oriented electrical steel sheet
US-11505843-B2 · Nov 22, 2022 · US
Hydrophilic stainless steel and method for manufacturing same
US-2022349062-A1 · Nov 3, 2022 · US
Fabrication method for a component having magnetic & non-magnetic dual phases
US-2022340987-A1 · Oct 27, 2022 · US
Method for producing grain oriented electrical steel sheet
US-2022106661-A1 · Apr 7, 2022 · US
Annealing separator for grain-oriented electrical steel sheet and method of producing grain-oriented electrical steel sheet
US-2022074012-A1 · Mar 10, 2022 · US
Annealing separator for grain-oriented electrical steel sheet and method of producing grain-oriented electrical steel sheet
US-2022074030-A1 · Mar 10, 2022 · US
Protective surface on stainless steel
US-2021214831-A1 · Jul 15, 2021 · US
Protective surface on stainless steel
US-11035031-B2 · Jun 15, 2021 · US
Endless metal ring manufacturing method and endless metal ring resin removal device
US-10926310-B2 · Feb 23, 2021 · US
Endless metal ring manufacturing method and endless metal ring resin removal device
US-10843245-B2 · Nov 24, 2020 · US
Grain-oriented electrical steel sheet and method for manufacturing same
US-2020087746-A1 · Mar 19, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C21D1/72?
- CPC C21D1/72 is the Cooperative Patent Classification code for “during chemical change of surfaces.”
- How many patents are filed under CPC C21D1/72 (during chemical change of surfaces)?
- Our database includes 39 publications tagged with this CPC code.
- Is patent activity under CPC C21D1/72 growing?
- Publication counts under this code: 5 in 2024 vs 1 in 2025 (latest complete years).