Patents by Inventor David Baird Bartholomew

David Baird Bartholomew 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).

  • Low-frequency receiving for radio frequency identification
    Patent number: 9785806
    Abstract: A radio frequency identification (RFID) tag includes a power source, a transmitter to transmit a unique identifier, and a receiver operatively coupled to the transmitter and to receive low-frequency signals from an active RFID transceiver located in the vicinity. The transmitter is activated by the power source responsive to the receiver receiving a wake up command at a predetermined low frequency from the active RFID transceiver. An RFID transceiver includes an antenna, non-transitory computer-readable medium storing instructions and a transmitter to transmit low-frequency signals to RFID tags through the antenna. A processing device of the RFID transceiver can execute the instructions to insert a station identifier (ID) into the low-frequency signals that direct the RFID tags to retransmit the station ID, wherein the station ID identifies an approximate location of the RFID tags.
    Type: Grant
    Filed: January 7, 2016
    Date of Patent: October 10, 2017
    Assignee: IMSAR LLC
    Inventors: David Baird Bartholomew, Gus Ryan German, Ryan Lee Smith, Caleb Hunter Chamberlain
  • LOW-FREQUENCY RECEIVING FOR RADIO FREQUENCY IDENTIFICAITON
    Publication number: 20160203347
    Abstract: A radio frequency identification (RFID) tag includes a power source, a transmitter to transmit a unique identifier, and a receiver operatively coupled to the transmitter and to receive low-frequency signals from an active RFID transceiver located in the vicinity. The transmitter is activated by the power source responsive to the receiver receiving a wake up command at a predetermined low frequency from the active RFID transceiver. An RFID transceiver includes an antenna, non-transitory computer-readable medium storing instructions and a transmitter to transmit low-frequency signals to RFID tags through the antenna. A processing device of the RFID transceiver can execute the instructions to insert a station identifier (ID) into the low-frequency signals that direct the RFID tags to retransmit the station ID, wherein the station ID identifies an approximate location of the RFID tags.
    Type: Application
    Filed: January 7, 2016
    Publication date: July 14, 2016
    Inventors: David Baird Bartholomew, Gus Ryan German, Ryan Lee Smith, Caleb Hunter Chamberlain