Patents by Inventor David B. Baret

David B. Baret 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).

  • Solid-state whistle and horn activation system for model railroads
    Patent number: 4747351
    Abstract: Apparatus for actuating a sounding device for model railroad engines powered by an alternating-current voltage impressed across two rails, which apparatus is completely solid state in nature. The system includes input and output transistors which are normally non-conducting together with means for producing a direct-current bias voltage for turning ON the input transistor when a direct-current bias voltage is superimposed on the alternating-current voltage impressed across the two rails. The input and output transistors are interconnected such that when the input transistor conducts so also does the output transistor to thereby power the sounding device.
    Type: Grant
    Filed: December 18, 1985
    Date of Patent: May 31, 1988
    Inventor: David B. Baret