3919528

Information

• Patent Grant
• 3919528

• References
• Source

• Patent Number

  3,919,528

• Date Filed

  Not available

• Date Issued

  Tuesday, November 11, 1975
  49 years ago

• CPC

  • G07F7/10 - together with a coded signal
  • G06K7/085 - metal detectors
  • G06Q20/347 - Passive cards
  • G07C9/00007 - Access-control involving the use of a pass
  • G07F7/1058 - PIN is checked locally

• US Classifications

  • 235 - Registers
  • 194 - Check-actuated control mechanisms
  • 336 - Inductor devices
  • 340 - Communications: electrical