Method for recovering gold from activated carbon
US-2017356066-A1 · Dec 14, 2017 · US
by leaching (C22B3/18 takes precedence)
by leaching (C22B3/18 takes precedence) · 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 | C22B3/04 |
| Official title | by leaching (C22B3/18 takes precedence) |
| Display label | by leaching (C22B3/18 takes precedence) |
| Total patents | 260 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 28 |
| 2016 | 19 |
| 2017 | 24 |
| 2018 | 21 |
| 2019 | 18 |
| 2020 | 20 |
| 2021 | 19 |
| 2022 | 10 |
| 2023 | 19 |
| 2024 | 31 |
| 2025 | 36 |
| 2026 | 15 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Systems and methods for monitoring metal recovery systems
US-2017356065-A1 · Dec 14, 2017 · US
Methods for purifying and recycling lead from spent lead-acid batteries
US-2017338530-A1 · Nov 23, 2017 · US
System and method for enhanced metal recovery during atmospheric leaching of metal sulfides
US-2017283908-A1 · Oct 5, 2017 · US
System and method for controlling frothing during atmospheric leaching of metal sulphides using silicates
US-2017275177-A1 · Sep 28, 2017 · US
Methods for purifying and recycling lead from spent lead-acid batteries
US-9751067-B2 · Sep 5, 2017 · US
Neutralization method and neutralization plant
US-9752211-B2 · Sep 5, 2017 · US
Apparatus and method for stripping solder metals during the recycling of waste electrical and electronic equipment
US-9731368-B2 · Aug 15, 2017 · US
Metal leach and recovery process
US-9657368-B2 · May 23, 2017 · US
Apparatus and method for stripping solder metals during the recycling of waste electrical and electronic equipment
US-9649712-B2 · May 16, 2017 · US
Hydrometallurgical process for the recovery of tellurium from high lead bearing copper refinery anode slime
US-9630844-B2 · Apr 25, 2017 · US
Method for recovering cyanide from a barren solution
US-2017081202-A1 · Mar 23, 2017 · US
Utilization of temperature heat adsorption skin temperature as scale control reagent driver
US-2017037493-A1 · Feb 9, 2017 · US
Method for treating sulfide-free minerals
US-2016355905-A1 · Dec 8, 2016 · US
Method for neutralizing sulfuric acid acidic solution and hydrometallurgical method for nickel oxide ore
US-9512503-B2 · Dec 6, 2016 · US
Utilization of temperature heat adsorption skin temperature as scale control reagent driver
US-9476108-B2 · Oct 25, 2016 · US
Leach aid for metal recovery
US-2016298209-A1 · Oct 13, 2016 · US
Flash vessel and method for operating same
US-9464341-B2 · Oct 11, 2016 · US
Methods to recover cesium or rubidium from secondary ore
US-9458524-B2 · Oct 4, 2016 · US
Method of ore processing
US-9447480-B2 · Sep 20, 2016 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C22B3/04?
- CPC C22B3/04 is the Cooperative Patent Classification code for “by leaching (C22B3/18 takes precedence).”
- How many patents are filed under CPC C22B3/04 (by leaching (C22B3/18 takes precedence))?
- Our database includes 260 publications tagged with this CPC code.
- Is patent activity under CPC C22B3/04 growing?
- Publication counts under this code: 31 in 2024 vs 36 in 2025 (latest complete years).