Porous medium with adjustable fluid permeability and associated systems and methods
US-11872525-B2 · Jan 16, 2024 · US
Group 4 or 5 metals
Group 4 or 5 metals · 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 | B01D71/0221 |
| Official title | {Group 4 or 5 metals} |
| Display label | Group 4 or 5 metals |
| Total patents | 100 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 13 |
| 2016 | 5 |
| 2017 | 10 |
| 2018 | 13 |
| 2019 | 12 |
| 2020 | 10 |
| 2021 | 12 |
| 2022 | 6 |
| 2023 | 5 |
| 2024 | 7 |
| 2025 | 5 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Separation of gases using reactive adsorbents and membranes
US-10814288-B2 · Oct 27, 2020 · US
Hybrid membranes and methods of making and use thereof
US-2020325295-A1 · Oct 15, 2020 · US
Inorganic structure body, device, and method for manufacturing inorganic structure body
US-2020254395-A1 · Aug 13, 2020 · US
Filtration filter
US-2020215497-A1 · Jul 9, 2020 · US
Filtration filter
US-10632427-B2 · Apr 28, 2020 · US
Alloy for catalytic membrane reactors
US-10590516-B2 · Mar 17, 2020 · US
Two-dimensional metal carbide desalination membrane
US-10493408-B2 · Dec 3, 2019 · US
Separation membrane structure
US-10478783-B2 · Nov 19, 2019 · US
Filtration filter
US-2019336919-A1 · Nov 7, 2019 · US
Porous bodies with enhanced crush strength
US-10449520-B2 · Oct 22, 2019 · US
Separation membrane for olefin separation and olefin separation method using the same
US-10434463-B2 · Oct 8, 2019 · US
Filtration filter
US-10399042-B2 · Sep 3, 2019 · US
Two-dimensional metal carbide antimicrobial membrane and antimicrobial agent
US-10399041-B2 · Sep 3, 2019 · US
Use of semipermeable membranes in cracking coils
US-2019241815-A1 · Aug 8, 2019 · US
Method of forming a pd-au layer on a substrate
US-2019127870-A1 · May 2, 2019 · US
Transfer line
US-10272393-B2 · Apr 30, 2019 · US
Transition metal containing carbon molecular sieve membranes and method to make them
US-2019118133-A1 · Apr 25, 2019 · US
Transfer line
US-2019015793-A1 · Jan 17, 2019 · US
Device for Producing Energy by Salinity Gradient Through Titanium Oxide Nanofluid Membranes
US-2018353906-A1 · Dec 13, 2018 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC B01D71/0221?
- CPC B01D71/0221 is the Cooperative Patent Classification code for “Group 4 or 5 metals.”
- How many patents are filed under CPC B01D71/0221 (Group 4 or 5 metals)?
- Our database includes 100 publications tagged with this CPC code.
- Is patent activity under CPC B01D71/0221 growing?
- Publication counts under this code: 7 in 2024 vs 5 in 2025 (latest complete years).