3435528

Information

• Patent Grant
• 3435528

• References
• Source

• Patent Number

  3,435,528

• Date Filed

  Not available

• Date Issued

  Tuesday, April 1, 1969
  56 years ago

• CPC

  • C09D13/00 - Pencil-leads Crayon compositions Chalk compositions
  • B43K19/04 - Pencils with metallic writing-core
  • C22C13/00 - Alloys based on tin

• US Classifications

  • 033 - Geometrical instruments
  • 346 - Recorders