3644893

Information

• Patent Grant
• 3644893

• References
• Source

• Patent Number

  3,644,893

• Date Filed

  Not available

• Date Issued

  Tuesday, February 22, 1972
  53 years ago

• CPC

  • G06K19/067 - Record carriers with conductive marks, printed circuits or semiconductor circuit elements
  • G06K7/085 - metal detectors
  • G07F7/08 - by coded identity card or credit card or other personal identification means

• US Classifications

  • 235 - Registers