Membranes for gas separation
US-12023633-B2 · Jul 2, 2024 · US
Polyethylenimine
Polyethylenimine · 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 | B01D71/601 |
| Official title | {Polyethylenimine} |
| Display label | Polyethylenimine |
| Total patents | 110 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 8 |
| 2016 | 7 |
| 2017 | 8 |
| 2018 | 7 |
| 2019 | 15 |
| 2020 | 13 |
| 2021 | 11 |
| 2022 | 14 |
| 2023 | 8 |
| 2024 | 7 |
| 2025 | 11 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Removing metal ions with a membrane based on anionic polyarylene ethersulfone and a cationic polymer with amino groups
US-2021178342-A1 · Jun 17, 2021 · US
Membranes for gas separation
US-2020398229-A1 · Dec 24, 2020 · US
Semipermeable membrane and preparation method thereof
US-10828608-B2 · Nov 10, 2020 · US
Assembly of Charge Mosaic Membranes from Ionic Polymers
US-2020324250-A1 · Oct 15, 2020 · US
Methods of membrane modification
US-10780402-B2 · Sep 22, 2020 · US
Polyacid-functionalized porous membranes, related methods, and related polyacid polymers
US-10773217-B2 · Sep 15, 2020 · US
Nanostructured polyelectrolytes for ion-selective membranes
US-10766005-B2 · Sep 8, 2020 · US
Separation of unsaturated organic compounds
US-10752861-B2 · Aug 25, 2020 · US
Asymmetric composite membranes and uses thereof
US-2020261855-A1 · Aug 20, 2020 · US
Mixed matrix membranes with embedded polymeric particles and networks and related compositions, methods, and systems
US-2020188862-A1 · Jun 18, 2020 · US
A carbon capture membrane
US-2020129930-A1 · Apr 30, 2020 · US
Nanostructured polyelectrolytes for ion-selective membranes
US-2020078736-A1 · Mar 12, 2020 · US
Dialysis membrane and method for its production
US-2020070106-A1 · Mar 5, 2020 · US
Separation of unsaturated organic compounds
US-2020024545-A1 · Jan 23, 2020 · US
Dialysis membrane and method for its production
US-10500549-B2 · Dec 10, 2019 · US
Removing metal ions from aqueous systems with an active layer membrane
US-2019358593-A1 · Nov 28, 2019 · US
Method for biological or biomimetic channel-based membrane fabrications using layer-by-layer structure
US-2019351374-A1 · Nov 21, 2019 · US
Composite membranes for separation of gases
US-2019329186-A1 · Oct 31, 2019 · US
Separation membrane for olefin separation and olefin separation method using the same
US-10434463-B2 · Oct 8, 2019 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC B01D71/601?
- CPC B01D71/601 is the Cooperative Patent Classification code for “Polyethylenimine.”
- How many patents are filed under CPC B01D71/601 (Polyethylenimine)?
- Our database includes 110 publications tagged with this CPC code.
- Is patent activity under CPC B01D71/601 growing?
- Publication counts under this code: 7 in 2024 vs 11 in 2025 (latest complete years).