1520380

Information

• Patent Grant
• 1520380

• References
• Source

• Patent Number

  1,520,380

• Date Filed

  Not available

• Date Issued

  Tuesday, December 23, 1924
  100 years ago

• CPC

  • B43L1/02 - Slates

• US Classifications

  • 434 - Education and demonstration
  • 106 - Compositions: coating or plastic
  • 427 - Coating processes