Impurity removal method of silicate solid waste and its application
US-12589420-B2 · Mar 31, 2026 · US
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Purification of silica sand or other minerals
Purification of silica sand or other minerals · 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 | C03C1/022 |
| Official title | {Purification of silica sand or other minerals} |
| Display label | Purification of silica sand or other minerals |
| Total patents | 23 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2017 | 1 |
| 2018 | 1 |
| 2019 | 6 |
| 2020 | 3 |
| 2021 | 2 |
| 2022 | 4 |
| 2023 | 4 |
| 2024 | 1 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Purification of quartz powders by removal of microparticles of refractory materials
US-11878937-B2 · Jan 23, 2024 · US
Preparation of a quartz glass body in a multi-chamber oven
US-11708290-B2 · Jul 25, 2023 · US
Impurity Removal Method of Silicate Solid Waste and Its Application
US-2023211392-A1 · Jul 6, 2023 · US
Method for treating pourable, inorganic grain, and rotary tube suitable for performing the method
US-11674755-B2 · Jun 13, 2023 · US
Removal of sand impurities in wet processing
US-11613496-B2 · Mar 28, 2023 · US
Removal of sand impurities in wet processing
US-2022380246-A1 · Dec 1, 2022 · US
Preparation of quartz glass bodies with dew point monitoring in the melting oven
US-11492282-B2 · Nov 8, 2022 · US
Preparation of carbon-doped silicon dioxide granulate as an intermediate in the preparation of quartz glass
US-11339076-B2 · May 24, 2022 · US
Preparation of an opaque quartz glass body
US-11236002-B2 · Feb 1, 2022 · US
Recovering sand, bentonite and organics from foundry sand waste
US-2021292224-A1 · Sep 23, 2021 · US
Purification of quartz powders by removal of microparticles of refractory materials
US-2021009461-A1 · Jan 14, 2021 · US
Preparation of a quartz glass body in a multi-chamber oven
US-2020361806-A1 · Nov 19, 2020 · US
Method for treating pourable, inorganic grain, and rotary tube suitable for performing the method
US-2020363129-A1 · Nov 19, 2020 · US
Preparation of a quartz glass body in a multi-chamber oven
US-10730780-B2 · Aug 4, 2020 · US
Preparation of an opaque quartz glass body
US-2019092674-A1 · Mar 28, 2019 · US
Preparation of a quartz glass body in a hanging sinter crucible
US-2019092676-A1 · Mar 28, 2019 · US
Preparation of quartz glass bodies with dew point monitoring in the melting oven
US-2019092675-A1 · Mar 28, 2019 · US
Preparation of a quartz glass body in a hanging metal sheet crucible
US-2019077688-A1 · Mar 14, 2019 · US
Reducing carbon content of silicon dioxide granulate and the preparation of a quartz glass body
US-2019077672-A1 · Mar 14, 2019 · US