Silicon nitride powder for sintering
US-12577107-B2 · Mar 17, 2026 · US
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After-treatment, e.g. grinding, purification
After-treatment, e.g. grinding, 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 | C01B21/0687 |
| Official title | {After-treatment, e.g. grinding, purification} |
| Display label | After-treatment, e.g. grinding, purification |
| Total patents | 15 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 4 |
| 2016 | 1 |
| 2018 | 1 |
| 2020 | 3 |
| 2023 | 1 |
| 2024 | 1 |
| 2025 | 2 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Process for producing silicon nitride powder
US-2026028226-A1 · Jan 29, 2026 · US
Reversible functionalization of nanopores using an adhesion layer
US-2025362261-A1 · Nov 27, 2025 · US
Silicon nitride powder and method for producing same, and silicon nitride sintered body and method for producing same
US-2025282688-A1 · Sep 11, 2025 · US
Method for preparing silicon nitride powder for manufacturing substrate and silicon nitride powder prepared thereby
US-2024140798-A1 · May 2, 2024 · US
Silicon nitride powder for sintering
US-2023140491-A1 · May 4, 2023 · US
Process for producing silicon nitride powder
US-2020399125-A1 · Dec 24, 2020 · US
Powder Composition Comprising First and Second Agglomerates of Inorganic Particles and Polymer Composition Comprising a Polymer and the Powder Composition
US-2020385625-A1 · Dec 10, 2020 · US
Surface-modified inorganic substance, method for manufacturing same, resin composition, thermally conductive material, and device
US-10633252-B2 · Apr 28, 2020 · US
Surface-modified inorganic substance, method for manufacturing same, resin composition, thermally conductive material, and device
US-2018327265-A1 · Nov 15, 2018 · US
Silicon nitride powder for mold release agent of casting mold for casting polycrystalline silicon ingot and method for manufacturing said silicon nitride powder, slurry containing said silicon nitride powder, casting mold for casting polycrystalline silicon ingot and method for manufacturing same, and method for manufacturing polycrystalline silicon ingot using said casting mold
US-2016159648-A1 · Jun 9, 2016 · US
Silicon nitride powder production method, silicon nitride powder, silicon nitride sintered body and circuit substrate using same
US-9085462-B2 · Jul 21, 2015 · US
Polycrystalline silicon ingot casting mold and method for producing same, and silicon nitride powder for mold release material for polycrystalline silicon ingot casting mold and slurry containing same
US-9022343-B2 · May 5, 2015 · US
Polycrystalline silicon ingot casting mold and method for producing same, and silicon nitride powder for mold release material for polycrystalline silicon ingot casting mold and slurry containing same
US-8973888-B2 · Mar 10, 2015 · US
Silicon nitride powder production method, silicon nitride powder, silicon nitride sintered body and circuit substrate using same
US-2015056121-A1 · Feb 26, 2015 · US