Patents by Inventor Robert T. Greene

Robert T. Greene 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).

  • Modem in-band secondary channel via radial modulation
    Patent number: 4525846
    Abstract: A transmission system for transmitting a first data series, and a second data series from a first modem to a second modem using QAM or PSK type modulation techniques. The first data series is sent using standard QAM techniques such as an 8-point scheme, wherein each point has a radial component. The second data series is sent by modulating slightly the radial components of the transmitted symbols between two values in accordance with the second data series.
    Type: Grant
    Filed: December 27, 1982
    Date of Patent: June 25, 1985
    Assignee: Paradyne Corporation
    Inventors: Gordon Bremer, William L. Betts, Robert T. Greene
  • Pulse code modulation compressor
    Patent number: 4037226
    Abstract: A pulse code modulation compressor converts linear pulse code modulation words into companded pulse code modulation words. A read only memory is loaded with a conversion table and used to perform successive approximations for the conversion. The converted output is then passed through a double buffer to allow independent operation of the conversion clock and output clock.
    Type: Grant
    Filed: January 7, 1976
    Date of Patent: July 19, 1977
    Assignee: NCR Corporation
    Inventors: William L. Betts, Robert T. Greene