Lamps having an incandescent body which is substantially non-conductive until heated, e.g. Nernst lamp

Filing statistics

CPC H01K 13/00 belongs to the parent subclass H01K, which recorded 1,175 patent applications worldwide between 2013 and 2023. Annual filings declined from 109 in 2013 to 70 in 2023 (-36%), peaking at 144 applications in 2014. The most active applicants in class H01 are SAMSUNG ELECTRONICS COMPANY (37,897 applications), TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY (36,116 applications) and APPLIED MATERIALS (21,640 applications).

Source: EPO PATSTAT, worldwide filings