Membranes for gas separation
US-12023633-B2 · Jul 2, 2024 · US
Polyvinylpyrrolidone
Polyvinylpyrrolidone · 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 | B01D71/441 |
| Official title | {Polyvinylpyrrolidone} |
| Display label | Polyvinylpyrrolidone |
| Total patents | 235 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 14 |
| 2016 | 7 |
| 2017 | 15 |
| 2018 | 19 |
| 2019 | 17 |
| 2020 | 31 |
| 2021 | 25 |
| 2022 | 37 |
| 2023 | 22 |
| 2024 | 24 |
| 2025 | 16 |
| 2026 | 8 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Lithium extraction composite for recovery of lithium from brines, and process of using said composition
US-2019275473-A1 · Sep 12, 2019 · US
Medical material, medical separation membrane, and blood purifier
US-2019209744-A1 · Jul 11, 2019 · US
Passive sampler and methods of making
US-2019162638-A1 · May 30, 2019 · US
Pvp- and/or pvl-containing composite membranes and methods of use
US-2019001273-A1 · Jan 3, 2019 · US
Carbon membrane for fluid separation, fluid separation membrane module, and method for producing carbon membrane for fluid separation
US-10159943-B2 · Dec 25, 2018 · US
Hollow-fiber membrane and hollow-fiber module for cell culture
US-2018361325-A1 · Dec 20, 2018 · US
High permeance and high selectivity facilitated transport membranes for olefin/paraffin separations
US-2018345230-A1 · Dec 6, 2018 · US
Polyamide-based water-treatment separation membrane having excellent durability, and manufacturing method therefor
US-10112154-B2 · Oct 30, 2018 · US
Method for reducing amyloid beta concentration in blood
US-10112000-B2 · Oct 30, 2018 · US
Method of Production of Nanoporous Membranes for Water Purification from Metal Ions at Low Differential Pressures
US-2018290108-A1 · Oct 11, 2018 · US
Membrane-forming dope for non-solvent induced phase separation methods, and a method for producing a porous hollow fiber membrane using the same
US-2018243700-A1 · Aug 30, 2018 · US
Nanofiber for filter medium, filter medium comprising same, method for producing same, and filter unit comprising same
US-2018236403-A1 · Aug 23, 2018 · US
Copolymer nanofilters with charge-patterned domains
US-2018193803-A1 · Jul 12, 2018 · US
Separation membrane for blood processing and blood processing device including the membrane
US-2018185793-A1 · Jul 5, 2018 · US
Virus filter
US-10005044-B2 · Jun 26, 2018 · US
Hollow fiber membrane, and method for producing hollow fiber membrane
US-2018169590-A1 · Jun 21, 2018 · US
Copolymer and medical device, separation membrane module for medical use, and blood purifier including the same
US-2018162977-A1 · Jun 14, 2018 · US
Porous membrane, blood purifying module incorporating porous membrane, and method for producing porous membrane
US-9993777-B2 · Jun 12, 2018 · US
Polymeric membranes for separation of gases
US-2018147513-A1 · May 31, 2018 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC B01D71/441?
- CPC B01D71/441 is the Cooperative Patent Classification code for “Polyvinylpyrrolidone.”
- How many patents are filed under CPC B01D71/441 (Polyvinylpyrrolidone)?
- Our database includes 235 publications tagged with this CPC code.
- Is patent activity under CPC B01D71/441 growing?
- Publication counts under this code: 24 in 2024 vs 16 in 2025 (latest complete years).