Method of making boron nitride nanotubes and reaction chamber therefore
US-2025243060-A1 · Jul 31, 2025 · US
Preparation by direct nitridation of elemental boron
Preparation by direct nitridation of elemental boron · 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 | C01B21/0641 |
| Official title | {Preparation by direct nitridation of elemental boron} |
| Display label | Preparation by direct nitridation of elemental boron |
| Total patents | 36 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 3 |
| 2016 | 4 |
| 2017 | 3 |
| 2018 | 2 |
| 2019 | 3 |
| 2020 | 3 |
| 2021 | 7 |
| 2022 | 3 |
| 2023 | 1 |
| 2024 | 4 |
| 2025 | 3 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Boron nitride nanotube-silicate glass composites
US-12338164-B2 · Jun 24, 2025 · US
Boron nitride nanomaterial and resin composition
US-12195667-B2 · Jan 14, 2025 · US
Method of fabricating hexagonal boron nitride
US-12180584-B2 · Dec 31, 2024 · US
System and methods for fabricating boron nitride nanostructures
US-12006210-B2 · Jun 11, 2024 · US
Method of producing single crystalline boron nitride nanosheets and boron carbon nitride nanosheets
US-2024017998-A1 · Jan 18, 2024 · US
Continuous boron nitride nanotube yarns and methods of production
US-11866376-B2 · Jan 9, 2024 · US
Method for preparing multi-layer hexagonal boron nitride film
US-11679978-B2 · Jun 20, 2023 · US
Method for producing metal nitride
US-2022411267-A1 · Dec 29, 2022 · US
System and methods for fabricating boron nitride nanostructures
US-2022281743-A1 · Sep 8, 2022 · US
System and methods for fabricating boron nitride nanostructures
US-11345595-B2 · May 31, 2022 · US
Boron nitride nanomaterial and resin composition
US-2021371719-A1 · Dec 2, 2021 · US
Method for preparing multi-layer hexagonal boron nitride film
US-2021363010-A1 · Nov 25, 2021 · US
Metal nitrides and/or metal carbides with nanocrystalline grain structure
US-11180420-B2 · Nov 23, 2021 · US
Metal nitrides and/or metal carbides with nanocrystalline grain structure
US-2021188716-A1 · Jun 24, 2021 · US
Metal nitrides and/or metal carbides with nanocrystalline grain structure
US-10974996-B2 · Apr 13, 2021 · US
Boron nitride nanotube-silicate glass composites
US-2021087102-A1 · Mar 25, 2021 · US
Method of fabricating hexagonal boron nitride
US-2021066069-A1 · Mar 4, 2021 · US
Continuous boron nitride nanotube yarns and methods of production
US-2020255985-A1 · Aug 13, 2020 · US
Method and device to synthesize boron nitride nanotubes and related nanoparticles
US-2020230566-A1 · Jul 23, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C01B21/0641?
- CPC C01B21/0641 is the Cooperative Patent Classification code for “Preparation by direct nitridation of elemental boron.”
- How many patents are filed under CPC C01B21/0641 (Preparation by direct nitridation of elemental boron)?
- Our database includes 36 publications tagged with this CPC code.
- Is patent activity under CPC C01B21/0641 growing?
- Publication counts under this code: 4 in 2024 vs 3 in 2025 (latest complete years).