Manufacture of hollow articles by transferring sheets, produced from fibres suspensions or papier-mâché by suction on wire-net moulds, to couch-moulds

Filing statistics

CPC D21J 5/00 belongs to the parent subclass D21J, which recorded 4,550 patent applications worldwide between 2013 and 2023. Annual filings grew from 142 in 2013 to 588 in 2023 (+314%), peaking at 708 applications in 2021. 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