Deep bluish-black effect pigments
US-12503604-B2 · Dec 23, 2025 · US
Ferrous oxide [FeO]
Ferrous oxide [FeO] · 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 | C01G49/04 |
| Official title | Ferrous oxide [FeO] |
| Display label | Ferrous oxide [FeO] |
| Total patents | 32 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 1 |
| 2016 | 3 |
| 2017 | 3 |
| 2019 | 3 |
| 2020 | 4 |
| 2021 | 2 |
| 2022 | 5 |
| 2023 | 5 |
| 2024 | 4 |
| 2025 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Process for the refining of iron oxides, iron oxides resulting thereof and their use
US-2025042764-A1 · Feb 6, 2025 · US
Method for treating water contaminated with polycyclic organics
US-12180087-B2 · Dec 31, 2024 · US
Water treatment and purification method
US-2024400407-A1 · Dec 5, 2024 · US
Method for treating water contaminated with polycyclic organics
US-2024300823-A1 · Sep 12, 2024 · US
Method for treating polluted composition
US-12017925-B2 · Jun 25, 2024 · US
Method of producing magnetic powder and method of producing magnetic recording medium
US-11830533-B2 · Nov 28, 2023 · US
Coloring ultraviolet protective agent
US-2023357582-A1 · Nov 9, 2023 · US
Method for treating polluted composition
US-2023331581-A1 · Oct 19, 2023 · US
Crystalline α-FE2O3 nanoparticles and method of making and use thereof in photodegradation of organic pollutants, as a photocatalyst and as an antibacterial composition
US-11739003-B2 · Aug 29, 2023 · US
Method for separating iron element in brine and application thereof
US-2023212027-A1 · Jul 6, 2023 · US
Composition and method for stabilizing iron compounds in an aqueous environment, and use of composition
US-11498859-B2 · Nov 15, 2022 · US
Method for treating slag
US-11479830-B2 · Oct 25, 2022 · US
Deep bluish-black effect pigments
US-2022162449-A1 · May 26, 2022 · US
Fe2o3 crystalline nanoparticles, compositions thereof and photocatalyst
US-2022089454-A1 · Mar 24, 2022 · US
Alpha-FE2O3 nanoparticles and method of making and use thereof in photodegradation of organic pollutants, as a photocatalyst and as an antibacterial composition
US-11235983-B2 · Feb 1, 2022 · US
ECO-FRIENDLY APPROACH TO a-FE2O3 AS MULTIFUNCTIONAL GREEN MATERIAL FOR WATER TREATMENT
US-2021087072-A1 · Mar 25, 2021 · US
Method of producing magnetic powder and method of producing magnetic recording medium
US-2021027807-A1 · Jan 28, 2021 · US
Composition and Method for Stabilizing Iron Compounds in an Aqueous Environment, and Use of Composition
US-2020354248-A1 · Nov 12, 2020 · US
Method for treating slag
US-2020354812-A1 · Nov 12, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C01G49/04?
- CPC C01G49/04 is the Cooperative Patent Classification code for “Ferrous oxide [FeO].”
- How many patents are filed under CPC C01G49/04 (Ferrous oxide [FeO])?
- Our database includes 32 publications tagged with this CPC code.
- Is patent activity under CPC C01G49/04 growing?
- Publication counts under this code: 4 in 2024 vs 2 in 2025 (latest complete years).