Hydrophilically modified fluorinated membrane (VI)
US-9849428-B2 · Dec 26, 2017 · US
Polymers of unsaturated acids or derivatives thereof, e.g. salts, amides, imides, nitriles, anhydrides, esters
Polymers of unsaturated acids or derivatives thereof, e.g. salts, amides, imides, nitriles, anhydrides, esters · 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 | B01D71/40 |
| Official title | Polymers of unsaturated acids or derivatives thereof, e.g. salts, amides, imides, nitriles, anhydrides, esters |
| Display label | Polymers of unsaturated acids or derivatives thereof, e.g. salts, amides, imides, nitriles, anhydrides, esters |
| Total patents | 326 |
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 | 12 |
| 2016 | 26 |
| 2017 | 37 |
| 2018 | 44 |
| 2019 | 51 |
| 2020 | 42 |
| 2021 | 51 |
| 2022 | 18 |
| 2023 | 23 |
| 2024 | 16 |
| 2025 | 5 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Functional polymer membrane and method of producing the same
US-9850147-B2 · Dec 26, 2017 · US
Polymer composition and porous membrane
US-9844759-B2 · Dec 19, 2017 · US
Method for producing acid gas separation composite membrane, and acid gas separation membrane module
US-9839882-B2 · Dec 12, 2017 · US
Facilitated CO2 transport membrane, method for producing same, resin composition for use in method for producing same, CO2 separation module and method and apparatus for separating CO2
US-9833746-B2 · Dec 5, 2017 · US
Composite anion exchange membrane, method for producing the same, ion exchange membrane module, and ion exchange device
US-2017333846-A1 · Nov 23, 2017 · US
Synthetic membranes and methods of use thereof
US-2017312698-A1 · Nov 2, 2017 · US
Graphene platelet-based polymers and uses thereof
US-2017298191-A1 · Oct 19, 2017 · US
Microporous polyolefin film, separator for battery, and production processes therefor
US-2017274329-A1 · Sep 28, 2017 · US
Method of forming an asymmetric membrane
US-9751050-B2 · Sep 5, 2017 · US
Copolymer and carbon dioxide gas separation membrane
US-9724652-B2 · Aug 8, 2017 · US
Water flux polymer membranes
US-9707524-B2 · Jul 18, 2017 · US
Graft copolymer functionalized article
US-2017165617-A1 · Jun 15, 2017 · US
Curable compositions and membranes
US-9675940-B2 · Jun 13, 2017 · US
Curable composition, functional polymer hardened product, stack or device comprising functional polymer membrane, amide compound, and manufacturing method thereof
US-2017152331-A1 · Jun 1, 2017 · US
Highly hydrophilic and highly oleophobic membrane for oil-water separation
US-9657126-B2 · May 23, 2017 · US
Graft copolymer functionalized article
US-9616394-B2 · Apr 11, 2017 · US
Polymer Composition and Porous Membrane
US-2017087520-A1 · Mar 30, 2017 · US
Membranes for gas separation
US-2017056839-A1 · Mar 2, 2017 · US
Separation membrane, method of producing the same and separation membrane module using the separation membrane
US-9561478-B2 · Feb 7, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC B01D71/40?
- CPC B01D71/40 is the Cooperative Patent Classification code for “Polymers of unsaturated acids or derivatives thereof, e.g. salts, amides, imides, nitriles, anhydrides, esters.”
- How many patents are filed under CPC B01D71/40 (Polymers of unsaturated acids or derivatives thereof, e.g. salts, amides, imides, nitriles, anhydrides, esters)?
- Our database includes 326 publications tagged with this CPC code.
- Is patent activity under CPC B01D71/40 growing?
- Publication counts under this code: 16 in 2024 vs 5 in 2025 (latest complete years).