Process for heavy metal removal from iron- and steelmaking flue dust
US-2026043110-A1 · Feb 12, 2026 · US
of zinc, cadmium or mercury
of zinc, cadmium or mercury · 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 | C25C1/16 |
| Official title | of zinc, cadmium or mercury |
| Display label | of zinc, cadmium or mercury |
| Total patents | 56 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2015 | 1 |
| 2016 | 4 |
| 2017 | 6 |
| 2018 | 3 |
| 2019 | 5 |
| 2020 | 17 |
| 2021 | 7 |
| 2023 | 4 |
| 2024 | 3 |
| 2025 | 5 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Method for recovering metal from waste printed circuit board and a cell thereof
US-12448695-B2 · Oct 21, 2025 · US
Sustainable method for recycling smelting works dusts and sludges to produce iron-containing, heavy-metal-depleted reclaimed materials with recovery of lead and zinc
US-12448666-B2 · Oct 21, 2025 · US
Extraction of calcium and other valuable elements via sonic stimulation and sequential electrolysis
US-2025320620-A1 · Oct 16, 2025 · US
Continuous process for sustainable production of hydrogen
US-12391547-B2 · Aug 19, 2025 · US
Zinc recovery method
US-2025154676-A1 · May 15, 2025 · US
Electrochemical metallurgical process for extracting metals and sulfur from metallic sulfides
US-2024328022-A1 · Oct 3, 2024 · US
Metal and tin alloy having low alpha-ray emission, and method for producing same
US-12000020-B2 · Jun 4, 2024 · US
Zinc recovery method
US-2024044029-A1 · Feb 8, 2024 · US
Method for recovering metal from waste printed circuit board and a cell thereof
US-2023416936-A1 · Dec 28, 2023 · US
Systems and methods for processing ash
US-2023330724-A1 · Oct 19, 2023 · US
Sustainable method for recycling smelting works dusts and sludges to produce iron-containing, heavy-metal-depleted reclaimed materials with recovery of lead and zinc
US-2023295765-A1 · Sep 21, 2023 · US
Metal and tin alloy having low alpha-ray emission, and method for producing same
US-2023085708-A1 · Mar 23, 2023 · US
Method and apparatus for electrochemical ammunition disposal and material recovery
US-11150067-B1 · Oct 19, 2021 · US
A continuous process for sustainable production of hydrogen
US-2021261407-A1 · Aug 26, 2021 · US
Process for Leaching Metal Sulfides with Reagents Having Thiocarbonyl Functional Groups
US-2021198767-A1 · Jul 1, 2021 · US
Reactor systems for recovering metals, and related methods
US-11035023-B2 · Jun 15, 2021 · US
Electrochemical deposition for metal ion extraction/removal from water
US-10981793-B2 · Apr 20, 2021 · US
Process for leaching metal sulfides with reagents having thiocarbonyl functional groups
US-10961604-B2 · Mar 30, 2021 · US
Process for leaching metal sulfides with reagents having thiocarbonyl functional groups
US-10954583-B2 · Mar 23, 2021 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C25C1/16?
- CPC C25C1/16 is the Cooperative Patent Classification code for “of zinc, cadmium or mercury.”
- How many patents are filed under CPC C25C1/16 (of zinc, cadmium or mercury)?
- Our database includes 56 publications tagged with this CPC code.
- Is patent activity under CPC C25C1/16 growing?
- Publication counts under this code: 3 in 2024 vs 5 in 2025 (latest complete years).