1804893

Information

• Patent Grant
• 1804893

• References
• Source

• Patent Number

  1,804,893

• Date Filed

  Not available

• Date Issued

  Tuesday, May 12, 1931
  93 years ago

• CPC

  • D21C3/045 - in presence of O2 or O3

• US Classifications

  • 162 - Paper making and fiber liberation