3683844

Information

• Patent Grant
• 3683844

• References
• Source

• Patent Number

  3,683,844

• Date Filed

  Not available

• Date Issued

  Tuesday, August 15, 1972
  52 years ago

• CPC

  • B42D9/008 - Devices for indicating a spot on a sheet

• US Classifications

  • 116 - Signals and indicators
  • 281 - Books, strips, and leaves