Patents by Inventor James M. Schaffer

James M. Schaffer 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: 7873121
    Abstract: The disclosure includes a system and method for oversampling and digitally filtering RFID signals. In some implementations of the present disclosure, an RF receiver includes an ADC, a comb filter, and a mask filter. The ADC is operable to directly sample an RF signal independent of a band pass filter and convert the RF signal to a digital signal. The RF signal is sampled at a rate greater than or equal to 60 MHz. The comb filter is coupled to the ADC. The mask filter is coupled to the comb filter. The comb filter and frequency mask filter are configured to filter out-of-band noise in the digital signal.
    Type: Grant
    Filed: April 27, 2007
    Date of Patent: January 18, 2011
    Assignee: Sirit Technologies, Inc.
    Inventors: Thomas J. Frederick, James M. Schaffer, Joseph P. Repke