of multi-stage type

Filing statistics

CPC F04F 9/02 belongs to the parent subclass F04F, which recorded 8,291 patent applications worldwide between 2013 and 2023. Annual filings declined from 836 in 2013 to 549 in 2023 (-34%). The most active applicants in class F04 are LG ELECTRONICS (3,855 applications), ROBERT BOSCH (3,549 applications) and GREE ELECTRIC APPLIANCES (2,273 applications).

Source: EPO PATSTAT, worldwide filings