1521509

Information

• Patent Grant
• 1521509

• References
• Source

• Patent Number

  1,521,509

• Date Filed

  Not available

• Date Issued

  Tuesday, December 30, 1924
  101 years ago

• CPC

  • G03F7/14 - Production of collotype printing forms

• US Classifications

  • 106 - Compositions: coating or plastic
  • 430 - Radiation imagery chemistry: process, composition, or product thereof