Zwitterion-containing membranes
US-10150088-B2 · Dec 11, 2018 · US
Polymers of vinyl aromatic compounds
Polymers of vinyl aromatic compounds · 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 | B01D71/28 |
| Official title | Polymers of vinyl aromatic compounds |
| Display label | Polymers of vinyl aromatic compounds |
| Total patents | 197 |
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 | 10 |
| 2016 | 24 |
| 2017 | 12 |
| 2018 | 19 |
| 2019 | 25 |
| 2020 | 29 |
| 2021 | 21 |
| 2022 | 24 |
| 2023 | 11 |
| 2024 | 13 |
| 2025 | 7 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
High permeance and high selectivity facilitated transport membranes for olefin/paraffin separations
US-2018345230-A1 · Dec 6, 2018 · US
Homogeneous Anion-Exchange Composite Membrane Having Excellent Chemical Resistance and Method for Producing the Same
US-2018326364-A1 · Nov 15, 2018 · US
Ceramic proton-conducting membranes
US-10124296-B2 · Nov 13, 2018 · US
Composite material comprising a non-crosslinked gel polymer
US-2018318773-A1 · Nov 8, 2018 · US
Synthetic membranes and methods of use thereof
US-10118134-B2 · Nov 6, 2018 · US
Polyamide-based water-treatment separation membrane having excellent durability, and manufacturing method therefor
US-10112154-B2 · Oct 30, 2018 · US
Composite structure
US-2018258295-A1 · Sep 13, 2018 · US
Ultra-breathable and protective membranes with sub-5 nm carbon nanotube pores
US-2018236287-A1 · Aug 23, 2018 · US
Gas sensor and method of manufacturing the same
US-2018224416-A1 · Aug 9, 2018 · US
Functional polymer membrane and method for producing same
US-10040916-B2 · Aug 7, 2018 · US
Multiblock copolymers and methods of use
US-10022679-B2 · Jul 17, 2018 · US
Processes for reducing the fouling of surfaces
US-2018056245-A1 · Mar 1, 2018 · US
Fluoropolymers and membranes comprising fluoropolymers (i)
US-2018043313-A1 · Feb 15, 2018 · US
Electrochemical Compression of Ammonia Using Ion Exchange Membranes
US-2017362720-A1 · Dec 21, 2017 · US
Films derived from two or more chemically distinct block copolymers, methods of making same, and uses thereof
US-2017327649-A1 · Nov 16, 2017 · US
Synthetic membranes and methods of use thereof
US-2017312698-A1 · Nov 2, 2017 · US
Porous membrane
US-2017266626-A1 · Sep 21, 2017 · US
Anion exchange membranes and process for making
US-9768502-B2 · Sep 19, 2017 · US
Polymeric molecular sieve membranes for gas separation
US-9731249-B2 · Aug 15, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC B01D71/28?
- CPC B01D71/28 is the Cooperative Patent Classification code for “Polymers of vinyl aromatic compounds.”
- How many patents are filed under CPC B01D71/28 (Polymers of vinyl aromatic compounds)?
- Our database includes 197 publications tagged with this CPC code.
- Is patent activity under CPC B01D71/28 growing?
- Publication counts under this code: 13 in 2024 vs 7 in 2025 (latest complete years).