1770521

Information

• Patent Grant
• 1770521

• References
• Source

• Patent Number

  1,770,521

• Date Filed

  Not available

• Date Issued

  Tuesday, July 15, 1930
  94 years ago

• CPC

  • D21J1/16 - Special fibreboard
  • Y10T428/24983 - Hardness
  • Y10T442/119 - Including a paper layer

• US Classifications

  • 428 - Stock material or miscellaneous articles
  • 442 - Fabric