Patents Assigned to J.M.J. Electronics, Inc.
  • Miniature portable public address system
    Patent number: 4090033
    Abstract: A portable public address system for use in motor buses which can also be used inside buildings or out-of-doors including a first case and a second case. Within the first case, which is approximately the size of a pack of cigarettes, is an amplifier circuit with a Darlington configuration transistor pre-amplifier, a three-position switch, a volume control and a microphone. Within the second case is a loudspeaker and battery supply which are electrically connected to the amplifier circuit in the first case through the switch.
    Type: Grant
    Filed: May 24, 1976
    Date of Patent: May 16, 1978
    Assignee: J.M.J. Electronics, Inc.
    Inventor: Milton M. Silverstein