Process of preparing a chemically pre-formed (cpf) iron negative electrode with water
US-2018371602-A1 · Dec 27, 2018 · US
Oxidising of ferrous surfaces
Oxidising of ferrous 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 | C23C8/18 |
| Official title | Oxidising of ferrous surfaces |
| Display label | Oxidising of ferrous surfaces |
| Total patents | 134 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 10 |
| 2016 | 17 |
| 2017 | 16 |
| 2018 | 18 |
| 2019 | 9 |
| 2020 | 10 |
| 2021 | 11 |
| 2022 | 14 |
| 2023 | 9 |
| 2024 | 13 |
| 2025 | 6 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Process of preparing a chemically pre-formed (cpf) iron negative electrode with oxidizing gases
US-2018375087-A1 · Dec 27, 2018 · US
Austenitic stainless steel sheet, cover member and production method for austenitic stainless steel sheet
US-2018363087-A1 · Dec 20, 2018 · US
Ferritic stainless steel foil
US-10151020-B2 · Dec 11, 2018 · US
Method for producing high-strength galvannealed steel sheets
US-10138530-B2 · Nov 27, 2018 · US
Roughly shaped material for induction hardened components and method for producing same
US-10072314-B2 · Sep 11, 2018 · US
Anti-coking iron spinel surface
US-2018251882-A1 · Sep 6, 2018 · US
Process of preparing a chemically pre-formed (CPF) iron negative electrode with oxidizing gases
US-10069133-B2 · Sep 4, 2018 · US
Process of preparing a chemically pre-formed (CPF) iron negative electrode with water
US-10066285-B2 · Sep 4, 2018 · US
Stainless steel foil for battery outer packaging
US-2018166661-A1 · Jun 14, 2018 · US
Stainless steel foil for battery outer packaging
US-2018127843-A1 · May 10, 2018 · US
Non-oriented electrical steel sheet and manufacturing method thereof
US-9934894-B2 · Apr 3, 2018 · US
Ferritic stainless steel sheet cover member and production method for ferritic stainless steel sheet
US-2018078981-A1 · Mar 22, 2018 · US
Urea synthesis method
US-9890114-B2 · Feb 13, 2018 · US
Grain-oriented electrical steel plate and production method therefor
US-2018010206-A1 · Jan 11, 2018 · US
Process of preparing a chemically pre-formed (cpf) iron negative electrode with water
US-2018010228-A1 · Jan 11, 2018 · US
Black-plated steel sheet
US-9863027-B2 · Jan 9, 2018 · US
Grain-oriented electrical steel plate and manufacturing method thereof
US-2017369960-A1 · Dec 28, 2017 · US
Preservation of strain in iron nitride magnet
US-2017365381-A1 · Dec 21, 2017 · US
Stainless steel substrate for solar cell having superior insulating properties and low thermal expansion coefficient and method of producing the same
US-9837567-B2 · Dec 5, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C23C8/18?
- CPC C23C8/18 is the Cooperative Patent Classification code for “Oxidising of ferrous surfaces.”
- How many patents are filed under CPC C23C8/18 (Oxidising of ferrous surfaces)?
- Our database includes 134 publications tagged with this CPC code.
- Is patent activity under CPC C23C8/18 growing?
- Publication counts under this code: 13 in 2024 vs 6 in 2025 (latest complete years).