Top IPC subclasses
1
|
D21H
|
10
|
pulp compositionspreparation thereof not covered by subclasses , impregnating or coating of papertre
|
2
|
B42D
|
3
|
booksbook coversloose leavesprinted matter of special format or style not otherwise provided fordevi
|
3
|
B41M
|
2
|
printing, duplicating, marking, or copying processescolour printing
|
4
|
B44F
|
1
|
special designs or pictures
|
5
|
D21F
|
1
|
paper-making machinesmethods of producing paper thereon
|