Mechanically stable ultrafiltration membrane, and method for producing same
US-12318734-B2 · Jun 3, 2025 · US
Mixed esters, e.g. cellulose acetate-butyrate
Mixed esters, e.g. cellulose acetate-butyrate · 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 | B01D71/18 |
| Official title | Mixed esters, e.g. cellulose acetate-butyrate |
| Display label | Mixed esters, e.g. cellulose acetate-butyrate |
| Total patents | 33 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2016 | 1 |
| 2017 | 1 |
| 2018 | 5 |
| 2019 | 3 |
| 2020 | 7 |
| 2021 | 6 |
| 2022 | 4 |
| 2023 | 4 |
| 2024 | 1 |
| 2025 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
High free volume membrane for gas separation
US-12134068-B2 · Nov 5, 2024 · US
High free volume membrane for gas separation
US-2023277980-A1 · Sep 7, 2023 · US
High free volume membrane for gas separation
US-11717787-B2 · Aug 8, 2023 · US
Cellulose ester and molded article thereof
US-11643476-B2 · May 9, 2023 · US
Method for preparing peptide emulsion formulation
US-2023055555-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
High free volume membrane for gas separation
US-2022212139-A1 · Jul 7, 2022 · US
Composite hollow-fiber membrane and production method therefor
US-11369925-B2 · Jun 28, 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
Separation membrane
US-10888822-B2 · Jan 12, 2021 · US
Cellulose mixed ester and molded article of same
US-2020270368-A1 · Aug 27, 2020 · US
Separation film, cellulose-based resin composition, and method for producing separation film
US-2020246759-A1 · Aug 6, 2020 · US
Separation membrane
US-2020197880-A1 · Jun 25, 2020 · US
Separation membrane
US-10639595-B2 · May 5, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC B01D71/18?
- CPC B01D71/18 is the Cooperative Patent Classification code for “Mixed esters, e.g. cellulose acetate-butyrate.”
- How many patents are filed under CPC B01D71/18 (Mixed esters, e.g. cellulose acetate-butyrate)?
- Our database includes 33 publications tagged with this CPC code.
- Is patent activity under CPC B01D71/18 growing?
- Publication counts under this code: 1 in 2024 vs 1 in 2025 (latest complete years).