1817525

Information

• Patent Grant
• 1817525

• References
• Source

• Patent Number

  1,817,525

• Date Filed

  Not available

• Date Issued

  Tuesday, August 4, 1931
  93 years ago

• CPC

  • D21C3/024 - with NH3 or H2O

• US Classifications

  • 162 - Paper making and fiber liberation