3750309

Information

• Patent Grant
• 3750309

• References
• Source

• Patent Number

  3,750,309

• Date Filed

  Not available

• Date Issued

  Tuesday, August 7, 1973
  51 years ago

• CPC

  • B42F13/22 - in two sections engaging each other when closed
  • B42D1/001 - with at least two separate sets of sheets
  • B42D1/005 - having plural perforation lines
  • B42D1/009 - characterised by printed matter not otherwise provided for

• US Classifications

  • 434 - Education and demonstration
  • 281 - Books, strips, and leaves
  • 283 - Printed matter
  • D07 - Equipment for preparing or serving food or drink not elsewhere specified