Low temperature direct copper-copper bonding
US-12424453-B2 · Sep 23, 2025 · US
of heavy metals
of heavy metals · 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 | C25F3/22 |
| Official title | of heavy metals |
| Display label | of heavy metals |
| Total patents | 62 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 4 |
| 2016 | 3 |
| 2017 | 2 |
| 2018 | 1 |
| 2019 | 7 |
| 2020 | 6 |
| 2021 | 8 |
| 2022 | 10 |
| 2023 | 10 |
| 2024 | 7 |
| 2025 | 4 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Method for smoothing surface of copper foil and copper foil obtained
US-12325929-B2 · Jun 10, 2025 · US
Methods for electropolishing and coating aluminum on air and/or moisture sensitive substrates
US-12129551-B2 · Oct 29, 2024 · US
Metal-resin composite, surface treatment method, and substrate of circuit board for high-frequency and high-speed signal transmission
US-2024342968-A1 · Oct 17, 2024 · US
Method of mass removal and electropolishing of stent alloys containing noble elements
US-2024229289-A1 · Jul 11, 2024 · US
Method for smoothing surface of copper foil and copper foil obtained
US-2024218554-A1 · Jul 4, 2024 · US
Electrolytic polishing treatment method for nickel-based alloy workpiece
US-2024191388-A1 · Jun 13, 2024 · US
Copper alloy plate, copper alloy plate with plating film, and methods for producing these
US-11926889-B2 · Mar 12, 2024 · US
Copper alloy sheet, copper alloy sheet with plating film, and method for producing same
US-11920228-B2 · Mar 5, 2024 · US
Stent device for spinal fusion
US-2023390454-A1 · Dec 7, 2023 · US
Copper alloy plate, plating film-attached copper alloy plate, and methods respectively for manufacturing these products
US-11781234-B2 · Oct 10, 2023 · US
Stent device for spinal fusion
US-11766506-B2 · Sep 26, 2023 · US
Electrolyte for electrochemical machining of γ-γ″ nickel-based superalloys
US-11712744-B2 · Aug 1, 2023 · US
Copper catalysts for electrochemical CO2 reduction to C2+ products
US-11708641-B2 · Jul 25, 2023 · US
Electro-oxidative metal removal accompanied by particle contamination mitigation in semiconductor processing
US-2023230847-A1 · Jul 20, 2023 · US
Electro-oxidative metal removal in through mask interconnect fabrication
US-11610782-B2 · Mar 21, 2023 · US
Copper alloy sheet, copper alloy sheet with plating film, and method for producing same
US-2023047984-A1 · Feb 16, 2023 · US
Methods for electropolishing and coating aluminum on air and/or moisture sensitive substrates
US-2023017923-A1 · Jan 19, 2023 · US
Electrolyte for electrochemical machining of gamma-gamma prime nickel-based superalloys
US-11548085-B2 · Jan 10, 2023 · US
Electrochemical reduction of carbon dioxide
US-11512400-B2 · Nov 29, 2022 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C25F3/22?
- CPC C25F3/22 is the Cooperative Patent Classification code for “of heavy metals.”
- How many patents are filed under CPC C25F3/22 (of heavy metals)?
- Our database includes 62 publications tagged with this CPC code.
- Is patent activity under CPC C25F3/22 growing?
- Publication counts under this code: 7 in 2024 vs 4 in 2025 (latest complete years).