High flux, chlorine resistant coating for sulfate removal membranes
US-2018369756-A1 · Dec 27, 2018 · US
Degradation or stability over time
Degradation or stability over time · Cooperative Patent Classification (CPC)
Separating, mixing, shaping, printing, and transporting materials.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | B01D2325/28 |
| Official title | Degradation or stability over time |
| Display label | Degradation or stability over time |
| Total patents | 198 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 15 |
| 2016 | 13 |
| 2017 | 19 |
| 2018 | 19 |
| 2019 | 23 |
| 2020 | 28 |
| 2021 | 23 |
| 2022 | 15 |
| 2023 | 17 |
| 2024 | 16 |
| 2025 | 10 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Metallopolyimide precursor fibers for aging-resistant carbon molecular sieve hollow fiber membranes with enhanced selectivity
US-10143973-B2 · Dec 4, 2018 · US
Polyamide-based water-treatment separation membrane having excellent durability, and manufacturing method therefor
US-10112154-B2 · Oct 30, 2018 · US
Metallopolyimide precursor fibers for aging-resistant carbon molecular sieve hollow fiber membranes with enhanced selectivity
US-10112149-B2 · Oct 30, 2018 · US
Power over ethernet power distribution system using dominant and non-dominant sensors
US-10095257-B2 · Oct 9, 2018 · US
Antifouling and antimicrobial coatings for thin film composite membranes
US-10086338-B2 · Oct 2, 2018 · US
Block polymer and polymer electrolyte membrane including same
US-2018251592-A1 · Sep 6, 2018 · US
Highly crosslinked hybrid polyimide-silsesquioxane membranes
US-10052592-B2 · Aug 21, 2018 · US
Two-layer photo-responsive membranes
US-2018133657-A1 · May 17, 2018 · US
Reverse osmosis composite membrane and method for manufacturing reverse osmosis composite membrane
US-2018043312-A1 · Feb 15, 2018 · US
Two-layer nanofiltration membranes
US-2018043315-A1 · Feb 15, 2018 · US
Conversion of media filter into membrane gravity filter
US-2018037473-A1 · Feb 8, 2018 · US
Filtration device for rapid separation of biological particles from complex matrices
US-9861939-B2 · Jan 9, 2018 · US
Membrane fouling reduction using chemical micropumps
US-9833744-B2 · Dec 5, 2017 · US
Polyamide water-treatment separation membrane having superior oxidation resistance and chlorine resistance properties, and method of manufacturing the same
US-9833751-B2 · Dec 5, 2017 · US
Radiation-resistant microporous membrane having a hydrophobicity gradient
US-9833752-B2 · Dec 5, 2017 · US
1234YF- and 1234ZE-based polymeric membrane materials, membrane preparations and uses thereof
US-9782730-B2 · Oct 10, 2017 · US
Hydrogen separation membrane, and method for manufacturing same
US-9751051-B2 · Sep 5, 2017 · US
Gas separation membrane, gas separation module, gas separation apparatus, and gas separation method
US-9700849-B2 · Jul 11, 2017 · US
Complex for acid gas separation, module for acid gas separation, and method for manufacturing module for acid gas separation
US-9700833-B2 · Jul 11, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC B01D2325/28?
- CPC B01D2325/28 is the Cooperative Patent Classification code for “Degradation or stability over time.”
- How many patents are filed under CPC B01D2325/28 (Degradation or stability over time)?
- Our database includes 198 publications tagged with this CPC code.
- Is patent activity under CPC B01D2325/28 growing?
- Publication counts under this code: 16 in 2024 vs 10 in 2025 (latest complete years).