Patents by Inventor Milton M. Silverstein

Milton M. Silverstein has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • 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