Carbon membrane for fluid separation, fluid separation membrane module, and method for producing carbon membrane for fluid separation
US-10159943-B2 · Dec 25, 2018 · US
Polyacrylonitrile
Polyacrylonitrile · 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 | B01D71/421 |
| Official title | {Polyacrylonitrile} |
| Display label | Polyacrylonitrile |
| Total patents | 191 |
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 | 15 |
| 2016 | 17 |
| 2017 | 11 |
| 2018 | 21 |
| 2019 | 19 |
| 2020 | 26 |
| 2021 | 20 |
| 2022 | 23 |
| 2023 | 18 |
| 2024 | 11 |
| 2025 | 8 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Zwitterion-containing membranes
US-10150088-B2 · Dec 11, 2018 · US
Forward osmosis-based separation membrane based on multilayer thin film, using crosslinking between organic monomers, and preparation method therefor
US-10143974-B2 · Dec 4, 2018 · US
Flux-enhanced hierarchical porous membrane for oil-water nanoemulsion separation
US-10124300-B2 · Nov 13, 2018 · US
Solvent-resistant separation membrane
US-10099183-B2 · Oct 16, 2018 · US
Method of Production of Nanoporous Membranes for Water Purification from Metal Ions at Low Differential Pressures
US-2018290108-A1 · Oct 11, 2018 · US
Integrated device for liver support system
US-10086123-B2 · Oct 2, 2018 · US
Apparatus and method for roll-to-roll membrane manufacture
US-2018243783-A1 · Aug 30, 2018 · US
Charged nanofibers and methods for making
US-2018209072-A1 · Jul 26, 2018 · US
Copolymer nanofilters with charge-patterned domains
US-2018193803-A1 · Jul 12, 2018 · US
Antibacterial and antifouling polymeric separation membrane and preparation method thereof
US-10016729-B2 · Jul 10, 2018 · US
Virus filter
US-10005044-B2 · Jun 26, 2018 · US
Membranes having antibiotic and hydrophilic properties and preparation method thereof
US-9919272-B2 · Mar 20, 2018 · US
Subsea water processing system and associated methods
US-2018071686-A1 · Mar 15, 2018 · US
Device for renal cell expansion
US-9902939-B2 · Feb 27, 2018 · US
Composite gas separation membrane, gas separation module, gas separation apparatus and gas separation method
US-9889412-B2 · Feb 13, 2018 · US
Method for preparing a nanofiber or non-woven mat
US-9879363-B2 · Jan 30, 2018 · US
Mixed matrix polymer compositions
US-9815032-B2 · Nov 14, 2017 · US
Solvent-resistant separation membrane
US-2017216781-A1 · Aug 3, 2017 · US
Carbon film for fluid separation, fluid separation film module, and method for producing carbon film for fluid separation
US-2017216779-A1 · Aug 3, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC B01D71/421?
- CPC B01D71/421 is the Cooperative Patent Classification code for “Polyacrylonitrile.”
- How many patents are filed under CPC B01D71/421 (Polyacrylonitrile)?
- Our database includes 191 publications tagged with this CPC code.
- Is patent activity under CPC B01D71/421 growing?
- Publication counts under this code: 11 in 2024 vs 8 in 2025 (latest complete years).