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CPC Subgroup
C03B 5/42

Details of construction of furnace walls, e.g. to prevent corrosion; Use of materials for furnace walls

Full Title

Melting in furnaces; Furnaces so far as specially adapted for glass manufacture > Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces > Details of construction of furnace walls, e.g. to prevent corrosion; Use of materials for furnace walls

4 direct subcodes

Child Classifications

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  • C03B 5/425 Preventing corrosion or erosion (C03B5/44 takes precedence)
  • C03B 5/43 Use of materials for furnace walls, e.g. fire-bricks
  • C03B 5/435 Heating arrangements for furnace walls
  • C03B 5/44 Cooling arrangements for furnace walls

Top Applicants

Top 10 applicants by patent filingsfor class C03, 2013–2023, worldwide · Source: EPO PATSTAT

  1. CORNING US 9,559
  2. SAINT-GOBAIN GLASS FR 3,824
  3. NIPPON ELECTRIC GLASS COMPANY JP 2,792
  4. SCHOTT DE 2,029
  5. AGC JP 1,938
  6. ASAHI GLASS COMPANY JP 1,679
  7. CORNING 1,650
  8. NIPPON ELECTRIC GLASS COMPANY 1,501
  9. A G C 1,049
  10. O-I (OWENS-ILLINOIS) US 1,027