Filtration system for pet water fountain, and method for water filtration
US-2017362092-A1 · Dec 21, 2017 · US
using anionic exchangers
using anionic exchangers · 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 | C02F2001/422 |
| Official title | {using anionic exchangers} |
| Display label | using anionic exchangers |
| Total patents | 287 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 23 |
| 2016 | 17 |
| 2017 | 20 |
| 2018 | 25 |
| 2019 | 24 |
| 2020 | 44 |
| 2021 | 29 |
| 2022 | 22 |
| 2023 | 34 |
| 2024 | 26 |
| 2025 | 17 |
| 2026 | 6 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Systems and methods for bromide separation and reuse
US-2017362098-A1 · Dec 21, 2017 · US
Metal-supported anion exchange resins and method of remediating toxic anions using the same
US-9844776-B2 · Dec 19, 2017 · US
Method for producing monodisperse, amido-methylated vinyl-aromatic bead polymers
US-9834653-B2 · Dec 5, 2017 · US
Crosslinked copolymer and ionic exchange film
US-9834623-B1 · Dec 5, 2017 · US
Excage: synthesis of viologen-like pyridinium-based cages for the selective capture of polycyclic aromatic hydrocarbons
US-9828259-B2 · Nov 28, 2017 · US
Preferential removal of hexavalent chromium from contaminated water
US-2017334746-A1 · Nov 23, 2017 · US
Ultrapure water production apparatus and ultrapure water production method
US-2017327396-A1 · Nov 16, 2017 · US
Water softening device and method for regenerating ion exchange resin
US-9815713-B2 · Nov 14, 2017 · US
Process for treating water with a counter-current ion exchange unit including silica and boron concentatration monitoring and regeneration thereof
US-9776892-B2 · Oct 3, 2017 · US
Ammonia sequestering system
US-2017275186-A1 · Sep 28, 2017 · US
System and method for organic solvent purification
US-9765024-B2 · Sep 19, 2017 · US
Method and apparatus for producing pure water
US-2017253499-A1 · Sep 7, 2017 · US
Household water filter element for removing radioactive substances
US-9731227-B2 · Aug 15, 2017 · US
Ion exchanger, water treatment device provided with same, and hot water supply device
US-9701547-B2 · Jul 11, 2017 · US
System and method for organic solvent purification
US-2017158635-A1 · Jun 8, 2017 · US
Filter system
US-2017136418-A1 · May 18, 2017 · US
Low Energy System and Method of Desalinating Seawater
US-2017050866-A1 · Feb 23, 2017 · US
A water reclamation method integrating magnetic resin adsorption and electrosorption
US-2017044039-A1 · Feb 16, 2017 · US
Phosphate Recovery by Acid Retardation
US-2017015568-A1 · Jan 19, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C02F2001/422?
- CPC C02F2001/422 is the Cooperative Patent Classification code for “using anionic exchangers.”
- How many patents are filed under CPC C02F2001/422 (using anionic exchangers)?
- Our database includes 287 publications tagged with this CPC code.
- Is patent activity under CPC C02F2001/422 growing?
- Publication counts under this code: 26 in 2024 vs 17 in 2025 (latest complete years).