Catalysts for oxidative coupling of methane
US-12447465-B2 · Oct 21, 2025 · US
Hafnium
Hafnium · Cooperative Patent Classification (CPC)
Separating, mixing, shaping, printing, and transporting materials.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | B01J2523/49 |
| Official title | Hafnium |
| Display label | Hafnium |
| Total patents | 27 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly growing.
| Year | Patents |
|---|---|
| 2015 | 1 |
| 2016 | 1 |
| 2018 | 1 |
| 2019 | 2 |
| 2020 | 3 |
| 2021 | 1 |
| 2022 | 2 |
| 2023 | 4 |
| 2024 | 6 |
| 2025 | 6 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
High entropy rare earth oxides for emissions control
US-12427477-B2 · Sep 30, 2025 · US
Organometallic complex, olefin polymerization catalyst system and polymerization process
US-2025257084-A1 · Aug 14, 2025 · US
Catalyst-containing material
US-12370528-B2 · Jul 29, 2025 · US
Ammonia decomposition catalyst systems
US-12297108-B2 · May 13, 2025 · US
Organometallic complex, olefin polymerization catalyst system and polymerization process
US-12275751-B2 · Apr 15, 2025 · US
Grain boundary and surface-doped rare earth manganese-zirconium composite compound and preparation method and use thereof
US-2024390878-A1 · Nov 28, 2024 · US
Organometallic complex, olefin polymerization catalyst system and polymerization process
US-2024294560-A1 · Sep 5, 2024 · US
Organometallic complex, olefin polymerization catalyst system and polymerization process
US-11999763-B2 · Jun 4, 2024 · US
Ammonia decomposition catalyst systems
US-2024132348-A1 · Apr 25, 2024 · US
Organometallic complex, olefin polymerization catalyst system and polymerization process
US-2024124502-A1 · Apr 18, 2024 · US
Ammonia decomposition catalyst systems
US-11891301-B2 · Feb 6, 2024 · US
Iron-potassium-cerium-based composite oxide catalyst, and preparation and application thereof
US-2023381751-A1 · Nov 30, 2023 · US
High entropy rare earth oxides for emissions control
US-2023226490-A1 · Jul 20, 2023 · US
Catalysts for oxidative coupling of methane
US-2023201803-A1 · Jun 29, 2023 · US
Cerium- and zirconium-based mixed oxide
US-11547982-B2 · Jan 10, 2023 · US
Catalyst-containing material
US-2022410125-A1 · Dec 29, 2022 · US
Suspension of nanoparticles of a mixed oxide
US-2022401921-A1 · Dec 22, 2022 · US
Catalyst and use of same
US-11045791-B2 · Jun 29, 2021 · US
Procatalyst and polymerization process using the same
US-10870713-B2 · Dec 22, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC B01J2523/49?
- CPC B01J2523/49 is the Cooperative Patent Classification code for “Hafnium.”
- How many patents are filed under CPC B01J2523/49 (Hafnium)?
- Our database includes 27 publications tagged with this CPC code.
- Is patent activity under CPC B01J2523/49 growing?
- Publication counts under this code: 6 in 2024 vs 6 in 2025 (latest complete years).