Patents by Inventor Leo N Ralph

Leo N Ralph 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).

  • Barking dog sound alarm system
    Patent number: 5886631
    Abstract: A new barking dog sound alarm system for scaring away intruders using the menacing sounds of a dog. The inventive device includes a microphone for detecting noise, a device to compare the detected noise level to a reference level so as to determine whether the detected noise is a potential intruder, a plurality of sound recordings of different excited dogs, a speaker for broadcasting one of the recordings, and a controller for activating one of the sound recordings when the detected noise is determined to be a potential intruder.
    Type: Grant
    Filed: February 4, 1997
    Date of Patent: March 23, 1999
    Inventor: Leo N Ralph