| 1/00 | Melting or fritting the enamels; Apparatus or furnaces therefor |
| 1/02 | Melting or fritting the enamels; Apparatus or furnaces therefor Granulating the melt; Drying the granules |
| 3/00 | Chemical treatment of the metal surfaces prior to coating (cleaning or de-greasing of metallic objects C23G) |
| 5/00 | Coating with enamels or vitreous layers |
| 5/02 | Coating with enamels or vitreous layers by wet methods |
| 5/04 | Coating with enamels or vitreous layers by dry methods |
| 5/06 | Coating with enamels or vitreous layers producing designs or letters |
| 5/08 | Coating with enamels or vitreous layers Applying enamels non-uniformly over the surface |
| 7/00 | Treating the coatings, e.g. drying before burning |
| 9/00 | Ovens specially adapted for firing enamels |
| 9/02 | Ovens specially adapted for firing enamels Non-electric muffle furnaces |
| 9/04 | Ovens specially adapted for firing enamels Non-electric tunnel ovens |
| 9/06 | Ovens specially adapted for firing enamels Electric furnaces |
| 9/08 | Ovens specially adapted for firing enamels Supporting devices for burning-bars |
| 9/10 | Ovens specially adapted for firing enamels Loading or unloading devices |
| 11/00 | Continuous processes for firing enamels; Apparatus therefor |
| 13/00 | After-treatment of the enamelled articles |
| 13/02 | After-treatment of the enamelled articles Removing defects by local re-melting of the enamel; Adjusting the shape |
| 15/00 | Joining enamelled articles to other enamelled articles by processes involving an enamelling step |
| 17/00 | De-enamelling |