1859620

Information

• Patent Grant
• 1859620

• References
• Source

• Patent Number

  1,859,620

• Date Filed

  Not available

• Date Issued

  Tuesday, May 24, 1932
  93 years ago

• CPC

  • G03F5/14 - by contact methods
  • Y10S283/902 - Anti-photocopy

• US Classifications

  • 355 - Photocopying
  • 283 - Printed matter