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Outline
Indent Level
Color Curly Brackets (indicating CPC extensions to IPC)

CPC
COOPERATIVE PATENT CLASSIFICATION
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ENAMELLING OF, OR APPLYING A VITREOUS LAYER TO, METALS( chemical composition of the enamels C03C )
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Melting or fritting the enamels ; Apparatus or furnaces therefor
C23D 1/02
.
Granulating the melt ; Drying the granules
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Guide Heading:
Coating with the enamels
Chemical treatment of the metal surfaces prior to coating( cleaning and de-greasing of metallic objects C23G )
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Coating with enamels or vitreous layers
{
( including applying fused refractory layers C23C 4/10 , C23C 24/10 )
}
C23D 5/005
.
{
by a method specially adapted for coating special objects
}
C23D 5/02
.
by wet methods
C23D 5/04
.
by dry methods
C23D 5/06
.
producing designs or letters
C23D 5/08
.
Applying enamels non-uniformly over the surface
.
with refractory materials
NOTE
-
Group C23D 5/10 is no longer used for classification. Documents are in the state of being reclassified to C23C 4/10 and C23C 24/10 .

Treating the coatings, e.g. drying before burning
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Guide Heading:
Firing the enamels
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Ovens specially adapted for firing enamels
C23D 9/02
.
Non-electric muffle furnaces
C23D 9/04
.
Non-electric tunnel ovens
C23D 9/06
.
Electric furnaces
C23D 9/08
.
Supporting devices for burning-bars
C23D 9/10
.
Loading or unloading devices
Continuous processes ; Apparatus therefor
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Guide Heading:
After-treatment
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After-treatment of the enamelled articles
C23D 13/02
.
Removing defects by local re-melting of the enamel ; Adjusting the shape
Joining enamelled articles to other enamelled articles by processes involving an enamelling step
De-enamelling
This page is owned by Office of Patent Classification.
Last Modified: 10/10/2013