Patents by Inventor Alberto Jose Machado

Alberto Jose Machado 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).

  • Patent number: 5877698
    Abstract: A system having several transmitters at fixed locations, such as in a supermarket, and a mobile receiver installed in each push-cart. Whenever a push-cart comes within the range of a transmitter, an exclusive link is set up therebetween for relaying to the receiver an audio message prerecorded in the transmitter for the push-cart user to hear. The receivers beam each "listening" control signals within a predetermined range, in response to which a transmitter within the range of one such receiver relays back a "sending" control signal and sends its prerecorded message which the receiver tunes into. The control signals are single-frequency signals modulating infrared carriers. The message signals are recorded preferably in analog solid-state memories and frequency-modulating radio or infrared carriers in different embodiments. Other uses include public galleries and museums, where one such receiver may be carried by the user instead of installing in a cart.
    Type: Grant
    Filed: February 1, 1996
    Date of Patent: March 2, 1999
    Inventors: Jaime Hector Kusnier, Jose Kulesz, Alberto Jose Machado