Membranes for acid-sensitive solvents
US-12502664-B2 · Dec 23, 2025 · US
Esters of organic acids
Esters of organic acids · 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 | B01D71/14 |
| Official title | Esters of organic acids |
| Display label | Esters of organic acids |
| Total patents | 32 |
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 |
| 2017 | 2 |
| 2018 | 2 |
| 2019 | 4 |
| 2020 | 6 |
| 2021 | 7 |
| 2022 | 4 |
| 2023 | 4 |
| 2025 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Mechanically stable ultrafiltration membrane, and method for producing same
US-12318734-B2 · Jun 3, 2025 · US
Separation membrane and method for producing separation membrane
US-11794150-B2 · Oct 24, 2023 · US
Cellulose ester and molded article thereof
US-11643476-B2 · May 9, 2023 · US
Composite body
US-11596904-B2 · Mar 7, 2023 · US
Separation membrane and method for producing separation membrane
US-2023053706-A1 · Feb 23, 2023 · US
Mechanically stable ultrafiltration membrane, and method for producing same
US-2022410081-A1 · Dec 29, 2022 · US
Separating membrane and method for manufacturing separating membrane
US-11446611-B2 · Sep 20, 2022 · US
Membranes for acid-sensitive solvents
US-2022184595-A1 · Jun 16, 2022 · US
Method for manufacturing gas separation membrane and gas separation membrane manufactured thereby
US-11241659-B2 · Feb 8, 2022 · US
Separation membrane
US-11103836-B2 · Aug 31, 2021 · US
Separation film and production method therefor
US-11103835-B2 · Aug 31, 2021 · US
Cellulose ester and molded article thereof
US-2021139611-A1 · May 13, 2021 · US
Cellulose ester and molded article thereof
US-10927190-B2 · Feb 23, 2021 · US
Semipermeable membrane
US-10926230-B2 · Feb 23, 2021 · US
MXene based compositing nanofiltration membrane and corresponding preparation method
US-10919000-B2 · Feb 16, 2021 · US
Separation membrane
US-10888822-B2 · Jan 12, 2021 · US
Method for manufacturing gas separation membrane and gas separation membrane manufactured thereby
US-2020238219-A1 · Jul 30, 2020 · US
Separation membrane
US-2020197880-A1 · Jun 25, 2020 · US
Composite body
US-2020197877-A1 · Jun 25, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC B01D71/14?
- CPC B01D71/14 is the Cooperative Patent Classification code for “Esters of organic acids.”
- How many patents are filed under CPC B01D71/14 (Esters of organic acids)?
- Our database includes 32 publications tagged with this CPC code.
- Is patent activity under CPC B01D71/14 growing?
- Publication counts under this code: 4 in 2023 vs 2 in 2025 (latest complete years).