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CPC Subgroup
D01F 9/04

of alginates

Full Title

Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments > of alginates

Filing statistics

CPC D01F 9/04 belongs to the parent subclass D01F, which recorded 55,662 patent applications worldwide between 2013 and 2023. Annual filings grew from 2,956 in 2013 to 4,878 in 2023 (+65%), peaking at 6,684 applications in 2020. The most active applicants in class D01 are TORAY INDUSTRIES (1,268 applications), MASCHINENFABRIK RIETER (1,200 applications) and NATIONAL DONG HWA UNIVERSITY (955 applications).

Source: EPO PATSTAT, worldwide filings

Top Applicants

Top 10 applicants by patent filingsfor class D01, 2013–2023, worldwide · Source: EPO PATSTAT

  1. TORAY INDUSTRIES JP 1,268
  2. MASCHINENFABRIK RIETER CH 1,200
  3. NATIONAL DONG HWA UNIVERSITY 955
  4. LENZING AT 602
  5. P&G (PROCTER & GAMBLE COMPANY) US 594
  6. WUHAN TEXTILE UNIVERSITY 494
  7. TRUETZSCHLER & COMPANY DE 453
  8. KOLON INDUSTRIES KR 433
  9. OERLIKON TEXTILE & COMPANY DE 430
  10. CHINESE ACADEMY OF SCIENCES 412