Reducing Energy Consumption in Nitrogen Production Using a Turboexpander
US-2025196057-A1 · Jun 19, 2025 · US
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characterised by the membrane
characterised by the membrane · Cooperative Patent Classification (CPC)
Chemical and metallurgical processes, compounds, and materials.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | C01B21/0444 |
| Official title | {characterised by the membrane} |
| Display label | characterised by the membrane |
| Total patents | 23 |
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 | 1 |
| 2016 | 2 |
| 2017 | 9 |
| 2018 | 4 |
| 2019 | 2 |
| 2021 | 2 |
| 2022 | 2 |
| 2025 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Reducing energy consumption for marine and offshore membrane applications
US-2022401878-A1 · Dec 22, 2022 · US
Graphene nanowindow structure and method for producing highly pure gas
US-11278849-B2 · Mar 22, 2022 · US
Graphene nanowindow structure and method for producing highly pure gas
US-2021060499-A1 · Mar 4, 2021 · US
Refrigerating and freezing device
US-10890369-B2 · Jan 12, 2021 · US
Separation membrane structure
US-10478783-B2 · Nov 19, 2019 · US
Refrigerating and freezing device
US-2019145691-A1 · May 16, 2019 · US
Ultra-thin, pinhole-free, flexible metal-organic films
US-10155843-B2 · Dec 18, 2018 · US
Fluid separation processes using membranes based on fluorinated and perfluorinated polymers
US-9975084-B2 · May 22, 2018 · US
Membrane-based air separation module
US-9932234-B2 · Apr 3, 2018 · US
Air separation module with increased permeate area
US-9932125-B2 · Apr 3, 2018 · US
Separation membrane structure
US-2017296983-A1 · Oct 19, 2017 · US
Fluid Separation Processes Using Membranes Based on Fluorinated and Perfluorinated Polymers
US-2017259204-A1 · Sep 14, 2017 · US
Air separation module with increased permeate area
US-2017247116-A1 · Aug 31, 2017 · US
Gas Separation Membranes Based on Fluorinated and Perfluorinated Polymers
US-2017203251-A1 · Jul 20, 2017 · US
Air separation module with increased permeate area
US-9675929-B2 · Jun 13, 2017 · US
Ultra-thin, Pinhole-free, Flexible Metal-Organic Films
US-2017158809-A1 · Jun 8, 2017 · US
Gas separation membranes based on fluorinated and perfluorinated polymers
US-9636632-B2 · May 2, 2017 · US
Asymmetric gas separation membrane, and methods for separating and recovering gases
US-2017095768-A1 · Apr 6, 2017 · US
Membrane-based air separation module
US-2017015557-A1 · Jan 19, 2017 · US