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CPC Subgroup
B22D 27/18

Measures for using chemical processes for influencing the surface composition of castings, e.g. for increasing resistance to acid attack

Full Title

Treating the metal in the mould while it is molten or ductile (B22D7/12, B22D11/10, B22D43/00 take precedence); > Measures for using chemical processes for influencing the surface composition of castings, e.g. for increasing resistance to acid attack

Filing statistics

CPC B22D 27/18 belongs to the parent subclass B22D, which recorded 70,364 patent applications worldwide between 2013 and 2023. Annual filings grew from 3,921 in 2013 to 7,174 in 2023 (+83%), peaking at 7,732 applications in 2020. The most active applicants in class B22 are GE (GENERAL ELECTRIC COMPANY) (2,157 applications), HEWLETT-PACKARD DEVELOPMENT COMPANY (1,633 applications) and SIEMENS (1,267 applications).

Source: EPO PATSTAT, worldwide filings

Top Applicants

Top 10 applicants by patent filingsfor class B22, 2013–2023, worldwide · Source: EPO PATSTAT

  1. GE (GENERAL ELECTRIC COMPANY) US 2,157
  2. HEWLETT-PACKARD DEVELOPMENT COMPANY US 1,633
  3. SIEMENS DE 1,267
  4. POSCO (POHANG IRON AND STEEL COMPANY) KR 1,124
  5. CHINESE ACADEMY OF SCIENCES 1,040
  6. UNITED TECHNOLOGIES CORPORATION (UTC) US 1,015
  7. JFE STEEL JP 884
  8. CENTRAL SOUTH UNIVERSITY 810
  9. HITACHI METALS JP 641
  10. SINTOKOGIO JP 624