Method for integrally forming graphene film (GF) of high specific surface area (SSA) by ultrafast ultraviolet (UV) laser processing
US-11845663-B2 · Dec 19, 2023 · US
Purification
Purification · 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 | C01B32/196 |
| Official title | Purification |
| Display label | Purification |
| Total patents | 72 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 4 |
| 2016 | 9 |
| 2017 | 9 |
| 2018 | 8 |
| 2019 | 4 |
| 2020 | 5 |
| 2021 | 9 |
| 2022 | 6 |
| 2023 | 9 |
| 2024 | 4 |
| 2025 | 5 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Ultrafast flash joule heating synthesis methods and systems for performing same
US-2023374623-A1 · Nov 23, 2023 · US
Method for preparing graphene by mechanical exfoliation and application thereof
US-2023339760-A1 · Oct 26, 2023 · US
Purification and drying of graphene oxide
US-11787698-B2 · Oct 17, 2023 · US
Highly dispersible graphene material
US-2023322560-A1 · Oct 12, 2023 · US
Nanocarbon separation device and nanocarbon separation method
US-11745189-B2 · Sep 5, 2023 · US
Method for the manufacture of pristine graphene from Kish graphite
US-11535519-B2 · Dec 27, 2022 · US
Production of graphene-structured products from coal using thermal molten salt process
US-11535518-B1 · Dec 27, 2022 · US
Porous graphene film, its manufacturing method and electronic product
US-11512000-B2 · Nov 29, 2022 · US
Graphene nanoribbon composite structure and method for making the same
US-2022177313-A1 · Jun 9, 2022 · US
Methods of treating graphitic materials and of preparing colloidal solutions including graphitic materials
US-11254577-B2 · Feb 22, 2022 · US
One-pot process for synthesis of graphene and graphene-derivatives from coal
US-2022024771-A1 · Jan 27, 2022 · US
Purification and drying of graphene oxide
US-2021395094-A1 · Dec 23, 2021 · US
Porous graphene film, its manufacturing method and electronic product
US-2021354990-A1 · Nov 18, 2021 · US
Scanning probe microscope for cleaning nanostructures
US-11130159-B2 · Sep 28, 2021 · US
Electrochemical graphene exfoliation with hydroxide intercalation
US-2021253432-A1 · Aug 19, 2021 · US
A method for the manufacture of pristine graphene from kish graphite
US-2021230000-A1 · Jul 29, 2021 · US
A method for the manufacture of reduced graphene oxide from kish graphite
US-2021221688-A1 · Jul 22, 2021 · US
Purification and drying of graphene oxide
US-10988383-B2 · Apr 27, 2021 · US
Continuous production of pristine graphene and graphene oxide
US-2021114880-A1 · Apr 22, 2021 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C01B32/196?
- CPC C01B32/196 is the Cooperative Patent Classification code for “Purification.”
- How many patents are filed under CPC C01B32/196 (Purification)?
- Our database includes 72 publications tagged with this CPC code.
- Is patent activity under CPC C01B32/196 growing?
- Publication counts under this code: 4 in 2024 vs 5 in 2025 (latest complete years).