1921504

Information

• Patent Grant
• 1921504

• References
• Source

• Patent Number

  1,921,504

• Date Filed

  Not available

• Date Issued

  Tuesday, August 8, 1933
  91 years ago

• CPC

  • D21F11/00 - Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
  • D04H1/16 - Laminated felts in which the separate layers are united by a felting process
  • D04H1/26 - Wood pulp
  • D04H1/425 - Cellulose series
  • D04H1/4374 - using different kinds of webs

• US Classifications

  • 162 - Paper making and fiber liberation