Soft magnetic iron sheet, method for producing soft magnetic iron sheet, and, iron core and dynamo-electric machine, each using soft magnetic iron sheet
US-12512239-B2 · Dec 30, 2025 · US
Extraction of nitrogen
Extraction of nitrogen · 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 | C21D3/08 |
| Official title | Extraction of nitrogen |
| Display label | Extraction of nitrogen |
| Total patents | 29 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2016 | 2 |
| 2017 | 1 |
| 2018 | 2 |
| 2019 | 1 |
| 2020 | 6 |
| 2021 | 6 |
| 2022 | 5 |
| 2023 | 2 |
| 2024 | 3 |
| 2025 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Soft Magnetic Iron Alloy Plate, Method for Manufacturing Soft Magnetic Iron Alloy Plate, and Iron Core and Rotating Electric Machine Employing Soft Magnetic Iron Alloy Plate
US-2024194383-A1 · Jun 13, 2024 · US
Fabrication method for a component having magnetic and non-magnetic dual phases
US-11926880-B2 · Mar 12, 2024 · US
Base sheet for grain-oriented electrical steel sheet, grain-oriented silicon steel sheet which is used as material of base sheet for grain-oriented electrical steel sheet, method of manufacturing base sheet for grain-oriented electrical steel sheet, and method of manufacturing grain-oriented electrical steel sheet
US-11884988-B2 · Jan 30, 2024 · US
Soft Magnetic Iron Sheet, Method for Producing Soft Magnetic Iron Sheet, and, Iron Core and Dynamo-Electric Machine, Each Using Soft Magnetic Iron Sheet
US-2023290551-A1 · Sep 14, 2023 · US
Method for manufacturing watch component
US-11754978-B2 · Sep 12, 2023 · US
Fabrication method for a component having magnetic & non-magnetic dual phases
US-2022340987-A1 · Oct 27, 2022 · US
FeNi ordered alloy, FeNi ordered alloy magnet, and method for manufacturing FeNi ordered alloy
US-11427895-B2 · Aug 30, 2022 · US
Gold-colored steel sheet and manufacturing method thereof
US-11339459-B2 · May 24, 2022 · US
FeNi ordered alloy and method for manufacturing FeNi ordered alloy
US-11313004-B2 · Apr 26, 2022 · US
Method for refining magnetic domains of grain-oriented electrical steel sheet
US-11313011-B2 · Apr 26, 2022 · US
Austenitic stainless steel workpiece
US-11185917-B2 · Nov 30, 2021 · US
Base sheet for grain-oriented electrical steel sheet, grain-oriented silicon steel sheet which is used as material of base sheet for grain-oriented electrical steel sheet, method of manufacturing base sheet for grain-oriented electrical steel sheet, and method of manufacturing grain-oriented electrical steel sheet
US-2021317542-A1 · Oct 14, 2021 · US
Method For Manufacturing Watch Component
US-2021278807-A1 · Sep 9, 2021 · US
Method for refining magnetic domains of grain-oriented electrical steel sheet
US-2021130922-A1 · May 6, 2021 · US
FeNi ORDERED ALLOY AND METHOD FOR MANUFACTURING FeNi ORDERED ALLOY
US-2021062280-A1 · Mar 4, 2021 · US
FeNi ordered alloy and method for manufacturing FeNi ordered alloy
US-10920292-B2 · Feb 16, 2021 · US
Nitrided steel part and method of production of same
US-10837096-B2 · Nov 17, 2020 · US
FeNi ORDERED ALLOY AND METHOD FOR MANUFACTURING FeNi ORDERED ALLOY
US-2020325551-A1 · Oct 15, 2020 · US
Fuel tank for a fuel cell system and method for producing a fuel tank
US-2020243882-A1 · Jul 30, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C21D3/08?
- CPC C21D3/08 is the Cooperative Patent Classification code for “Extraction of nitrogen.”
- How many patents are filed under CPC C21D3/08 (Extraction of nitrogen)?
- Our database includes 29 publications tagged with this CPC code.
- Is patent activity under CPC C21D3/08 growing?
- Publication counts under this code: 3 in 2024 vs 1 in 2025 (latest complete years).