1639613

Information

• Patent Grant
• 1639613

• References
• Source

• Patent Number

  1,639,613

• Date Filed

  Not available

• Date Issued

  Tuesday, August 16, 1927
  97 years ago

• CPC

  • D21C7/00 - Digesters
  • Y10S165/141 - Concentric flow confining structures or chambers

• US Classifications

  • 165 - Heat exchange
  • 162 - Paper making and fiber liberation
  • 220 - Receptacles