Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material (chemical features in the manufacture of artificial fibres D01F)

Filing statistics

CPC D21H 13/00 belongs to the parent subclass D21H, which recorded 50,846 patent applications worldwide between 2013 and 2023. Annual filings declined from 3,964 in 2013 to 3,670 in 2023 (-7%), peaking at 5,497 applications in 2018. The most active applicants in class D21 are VOITH PATENT (1,857 applications), STORA ENSO (1,552 applications) and KEMIRA (1,173 applications).

Source: EPO PATSTAT, worldwide filings