Porous Air Permeable Polytetrafluoroethylene Composites with Improved Mechanical and Thermal Properties
US-2018163089-A1 · Jun 14, 2018 · US
Polyether-imides
Polyether-imides · 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 | B01D71/643 |
| Official title | {Polyether-imides} |
| Display label | Polyether-imides |
| Total patents | 160 |
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 | 16 |
| 2016 | 22 |
| 2017 | 19 |
| 2018 | 16 |
| 2019 | 17 |
| 2020 | 16 |
| 2021 | 13 |
| 2022 | 10 |
| 2023 | 11 |
| 2024 | 14 |
| 2025 | 5 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Antitelescoping device and clamp for spiral wound modules comprising a vent
US-9925498-B2 · Mar 27, 2018 · US
Polyetherimide composite nanofiltration membrane and preparation method thereof
US-9889413-B2 · Feb 13, 2018 · US
Polymers of intrinsic microporosity
US-2017369652-A1 · Dec 28, 2017 · US
Membrane distillation system which is capable of real-time monitoring on membrane scaling
US-2017354931-A1 · Dec 14, 2017 · US
Porous membrane having immobilized enzyme, porous membrane composite including the same, and preparation method thereof
US-9840701-B2 · Dec 12, 2017 · US
Method for synthesis of thin film composite membranes
US-9808768-B2 · Nov 7, 2017 · US
Membranes
US-9808771-B2 · Nov 7, 2017 · US
Gas Separation Membranes with Intermixed Layers
US-2017296981-A1 · Oct 19, 2017 · US
Gas separation membranes with intermixed layers
US-9731248-B2 · Aug 15, 2017 · US
Uncrosslinked, high molecular weight, monoesterified polyimide polymer containing a small amount of bulky diamine
US-9718032-B2 · Aug 1, 2017 · US
Composite hollow fiber membranes useful for CO2 removal from natural gas
US-9718031-B2 · Aug 1, 2017 · US
Gas separation membrane module and gas separation method
US-9718023-B2 · Aug 1, 2017 · US
Uncrosslinked, high molecular weight, polyimide polymer containing a small amount of bulky diamine
US-9718033-B2 · Aug 1, 2017 · US
Curable compositions and membranes
US-9700848-B2 · Jul 11, 2017 · US
Composite gas separation membranes with dialkysiloxane intermediate layer
US-9694325-B2 · Jul 4, 2017 · US
Polyetherimide composite nanofiltration membrane and preparation method thereof
US-2017157574-A1 · Jun 8, 2017 · US
Gas Separation Process
US-2017080381-A1 · Mar 23, 2017 · US
Gas Separation Process
US-2017080380-A1 · Mar 23, 2017 · US
Membranes
US-9586183-B2 · Mar 7, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC B01D71/643?
- CPC B01D71/643 is the Cooperative Patent Classification code for “Polyether-imides.”
- How many patents are filed under CPC B01D71/643 (Polyether-imides)?
- Our database includes 160 publications tagged with this CPC code.
- Is patent activity under CPC B01D71/643 growing?
- Publication counts under this code: 14 in 2024 vs 5 in 2025 (latest complete years).