| IPC 7 English version |
| Class C22 |
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| SECTION C – CHEMISTRY; METALLURGY |
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| C 22 | METALLURGY (of iron C21); FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS (general methods or devices for heat treatment of ferrous or non-ferrous metals or alloys C21D; production of metals by electrolysis or electrophoresis C25) |
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| Note |
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| The codes of subclass C22K are only for use as indexing codes associated with subclasses C21D, C22C or C22F, so as to provide information concerning changing the physical characteristics of alloys. [6] |
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| C 22 B | PRODUCTION OR REFINING OF METALS (making metallic powder or suspensions thereof B22F 9/00; electrolytic C25); PRETREATMENT OF RAW MATERIALS |
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| C 22 C | ALLOYS (flints C06C 15/00; treatment of alloys C21D, C22F) |
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| C 22 F | CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS OR NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass C23F 17/00) |
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| C 22 K | INDEXING SCHEME ASSOCIATED WITH SUBCLASSES C21D, C22C OR C22F, RELATING TO CHANGING THE PHYSICAL CHARACTERISTICS OF ALLOYS [6] |
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