Patents Assigned to Friedemann Joachim Schulz
  • Alarm combination lock
    Patent number: 4277777
    Abstract: This invention relates to safety and security systems. Selective analog solid state electronics which permit entry to or exit from a secured area for authorized personal by a sequential push button operation or by coded card reading.
    Type: Grant
    Filed: March 22, 1979
    Date of Patent: July 7, 1981
    Assignee: Friedemann Joachim Schulz
    Inventor: Friedemann J. Schulz