3926021

Information

• Patent Grant
• 3926021

• References
• Source

• Patent Number

  3,926,021

• Date Filed

  Not available

• Date Issued

  Tuesday, December 16, 1975
  49 years ago

• CPC

  • G06K7/085 - metal detectors
  • G06K19/06187 - with magnetically detectable marking
  • G07C9/00007 - Access-control involving the use of a pass
  • G07C9/00023 - the system having a variable access-code
  • G07C9/00722 - with magnetic components
  • G07C9/00904 - for hotels, motels, office buildings or the like
  • Y10T70/7113 - Projected and retracted electrically

• US Classifications

  • 340 - Communications: electrical
  • 070 - Locks
  • 235 - Registers
  • 361 - Electricity: electrical systems and devices