3553421

Information

• Patent Grant
• 3553421

• References
• Source

• Patent Number

  3,553,421

• Date Filed

  Not available

• Date Issued

  Tuesday, January 5, 1971
  53 years ago

• CPC

  • B41J29/28 - Writing or like instruments in holders or guides
  • B43L19/0043 - Erasing by electronic or electrolytic means

• US Classifications

  • 219 - Electric heating
  • 400 - Typewriting machines