Patent classifications
C
CHEMISTRY; METALLURGY
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C01
INORGANIC CHEMISTRY
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C01B
NON-METALLIC ELEMENTS; COMPOUNDS THEREOF;; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
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21/00
Nitrogen; Compounds thereof
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C01B21/06
Binary compounds of nitrogen with metals, with silicon, or with boron,; or with carbon, i.e. nitrides; Compounds of nitrogen with more than one metal, silicon or boron
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C01B21/0648
After-treatment, e.g. grinding, purification
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