3739739

Information

• Patent Grant
• 3739739

• References
• Source

• Patent Number

  3,739,739

• Date Filed

  Not available

• Date Issued

  Tuesday, June 19, 1973
  51 years ago

• CPC

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

• US Classifications

  • 116 - Signals and indicators
  • 040 - Card, picture, or sign exhibiting
  • 281 - Books, strips, and leaves
  • 283 - Printed matter
  • 359 - Optical: systems and elements
  • 434 - Education and demonstration