System and method of deionization of water
US-11447404-B2 · Sep 20, 2022 · US
Hardness
Hardness · 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 | C02F2209/055 |
| Official title | Hardness |
| Display label | Hardness |
| Total patents | 132 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 7 |
| 2016 | 6 |
| 2017 | 4 |
| 2018 | 2 |
| 2019 | 12 |
| 2020 | 11 |
| 2021 | 12 |
| 2022 | 21 |
| 2023 | 14 |
| 2024 | 15 |
| 2025 | 18 |
| 2026 | 10 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Real-time management of device maintenance
US-2022263740-A1 · Aug 18, 2022 · US
Methods and Systems for Treating Phosphogypsum-Containing Water
US-2022259085-A1 · Aug 18, 2022 · US
Chlorine generator system
US-11407661-B2 · Aug 9, 2022 · US
Dishmachine
US-2022125274-A1 · Apr 28, 2022 · US
Methods for predicting and monitoring scale formation in industrial water systems
US-2022073371-A1 · Mar 10, 2022 · US
Automatic Descaling System
US-2021403354-A1 · Dec 30, 2021 · US
Composite phosphorus-based calcification inhibitor
US-11192812-B2 · Dec 7, 2021 · US
Dishmachine
US-11191419-B2 · Dec 7, 2021 · US
Laundry washing machine with water softening system and method for controlling a laundry washing machine
US-11180887-B2 · Nov 23, 2021 · US
Methods for online control of a chemical treatment solution using scale saturation indices
US-2021331942-A1 · Oct 28, 2021 · US
Cooling pond water treatment system
US-2021323851-A1 · Oct 21, 2021 · US
Apparatus for inhibiting formation of calcium based crystal and apparatus for water treatment using the same
US-2021300805-A1 · Sep 30, 2021 · US
Automatic descaling system
US-11117820-B2 · Sep 14, 2021 · US
Process for treating frac flowback and produced water including naturally occurring radioactive material
US-2021163327-A1 · Jun 3, 2021 · US
Method for increasing the magnesium ion concentration in feed water
US-2021147266-A1 · May 20, 2021 · US
Self contained, automatic water quality monitoring and treatment system
US-2021147256-A1 · May 20, 2021 · US
Composite phosphorus-based calcification inhibitor
US-2021032140-A1 · Feb 4, 2021 · US
Ion removing system
US-2020407254-A1 · Dec 31, 2020 · US
Soft-water system
US-2020346952-A1 · Nov 5, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C02F2209/055?
- CPC C02F2209/055 is the Cooperative Patent Classification code for “Hardness.”
- How many patents are filed under CPC C02F2209/055 (Hardness)?
- Our database includes 132 publications tagged with this CPC code.
- Is patent activity under CPC C02F2209/055 growing?
- Publication counts under this code: 15 in 2024 vs 18 in 2025 (latest complete years).