Compositions for tungsten etching inhibition
US-12378439-B2 · Aug 5, 2025 · US
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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 | C09F1/02 |
| Official title | Purification |
| Display label | Purification |
| Total patents | 21 |
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 | 2 |
| 2019 | 2 |
| 2020 | 8 |
| 2021 | 4 |
| 2022 | 3 |
| 2024 | 1 |
| 2025 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Purification methods for modified rosin compositions
US-2024360312-A1 · Oct 31, 2024 · US
Compositions for tungsten etching inhibition
US-2022267643-A1 · Aug 25, 2022 · US
Deodorized rosin ester and methods for making
US-11279849-B2 · Mar 22, 2022 · US
Fractionation of crude tall oil
US-2022018069-A1 · Jan 20, 2022 · US
Deodorized Rosin Ester and Methods for Making
US-2021363385-A1 · Nov 25, 2021 · US
Light color rosin ester compositions and methods of making same
US-11111411-B2 · Sep 7, 2021 · US
Desulfurized tall oil and derivatives thereof
US-11041095-B2 · Jun 22, 2021 · US
Light-colored rosin and rosin ester compositions
US-11034858-B2 · Jun 15, 2021 · US
Fractionation of biomass-based material
US-10876071-B2 · Dec 29, 2020 · US
Desulfurized Tall Oil and Derivatives Thereof
US-2020369916-A1 · Nov 26, 2020 · US
Process for purification of biological feed material
US-10815428-B2 · Oct 27, 2020 · US
Light color rosin ester compositions and methods of making same
US-2020224056-A1 · Jul 16, 2020 · US
Light-colored rosin and rosin ester compositions
US-2020199408-A1 · Jun 25, 2020 · US
Purification methods of rosins
US-2020190360-A1 · Jun 18, 2020 · US
Light rosin ester compositions and methods of making same
US-10611926-B2 · Apr 7, 2020 · US
Fractionation of biomass-based material
US-2020017800-A1 · Jan 16, 2020 · US
Process for producing biofuel and biofuel components
US-10240095-B2 · Mar 26, 2019 · US
Light rosin ester compositions and methods of making same
US-2019002733-A1 · Jan 3, 2019 · US
Process for purification of biological feed material
US-2015052807-A1 · Feb 26, 2015 · US