Multilayer electronic component
US-2024242884-A1 · Jul 18, 2024 · US
Iron oxides or oxide forming salts thereof, e.g. hematite, magnetite
Iron oxides or oxide forming salts thereof, e.g. hematite, magnetite · 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 | C04B2235/3272 |
| Official title | Iron oxides or oxide forming salts thereof, e.g. hematite, magnetite |
| Display label | Iron oxides or oxide forming salts thereof, e.g. hematite, magnetite |
| Total patents | 1,011 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 98 |
| 2016 | 101 |
| 2017 | 99 |
| 2018 | 95 |
| 2019 | 96 |
| 2020 | 98 |
| 2021 | 85 |
| 2022 | 90 |
| 2023 | 87 |
| 2024 | 78 |
| 2025 | 61 |
| 2026 | 23 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Stabilized zirconia sintered body and zirconia powder
US-2024101482-A1 · Mar 28, 2024 · US
Highly dense red mud shields for x-ray and gamma-ray attenuation
US-2024018050-A1 · Jan 18, 2024 · US
Refractory object including beta alumina and processes of making and using the same
US-9216928-B2 · Dec 22, 2015 · US
Piezoelectric material, piezoelectric device, and electronic apparatus
US-2015364672-A1 · Dec 17, 2015 · US
Zirconia sintered body, zirconia composition and zirconia calcined body, and dental prosthesis
US-9212065-B2 · Dec 15, 2015 · US
Resorbable ceramics with controlled strength loss rates
US-2015352248-A1 · Dec 10, 2015 · US
Cathode material and fuel cell
US-2015349349-A1 · Dec 3, 2015 · US
Insulation material and method of manufacturing same
US-2015345690-A1 · Dec 3, 2015 · US
Fused and coated silica grains
US-9193631-B2 · Nov 24, 2015 · US
Method for doping or coloring ceramics, glass ceramics, or glass
US-9186227-B2 · Nov 17, 2015 · US
Colored translucent zirconia sintered body and its use
US-2015315086-A1 · Nov 5, 2015 · US
Ceramic material, method for producing the ceramic material, and resistor component comprising the ceramic material
US-9169161-B2 · Oct 27, 2015 · US
Ferrite sintered plate and ferrite sintered sheet
US-2015302958-A1 · Oct 22, 2015 · US
Dielectric ceramic composition and multilayer ceramic capacitor containing the same
US-2015299048-A1 · Oct 22, 2015 · US
Porous mullite bodies having improved thermal stability
US-2015299045-A1 · Oct 22, 2015 · US
Electrolytic cell
US-2015299880-A1 · Oct 22, 2015 · US
Lead-free piezo-electric porcelain composition, piezo-electric element using the same, and method for producing lead-free piezo-electric porcelain composition
US-2015295162-A1 · Oct 15, 2015 · US
Insulator for spark plug and spark plug
US-9160145-B2 · Oct 13, 2015 · US
Porous mullite bodies having improved thermal stability
US-2015284294-A1 · Oct 8, 2015 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C04B2235/3272?
- CPC C04B2235/3272 is the Cooperative Patent Classification code for “Iron oxides or oxide forming salts thereof, e.g. hematite, magnetite.”
- How many patents are filed under CPC C04B2235/3272 (Iron oxides or oxide forming salts thereof, e.g. hematite, magnetite)?
- Our database includes 1,011 publications tagged with this CPC code.
- Is patent activity under CPC C04B2235/3272 growing?
- Publication counts under this code: 78 in 2024 vs 61 in 2025 (latest complete years).