Patents by Inventor James D. Nihart

James D. Nihart 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).

  • Hand-held tester for communications ports of a data processor
    Patent number: 4941115
    Abstract: A hand-held battery-powered instrument tests communications ports of a data-processing system by analyzing received data frames for multiple conditions, such as parity, poll commands, and violation sequences. Indicator lights show proper/improper operation of the port, and also indicate phase reversal of the lines.
    Type: Grant
    Filed: June 20, 1988
    Date of Patent: July 10, 1990
    Assignee: International Business Machines Corporation
    Inventors: James D. Nihart, Samuel M. Prabhakar
  • Dynamic threshold device
    Patent number: 4345314
    Abstract: A two-dimensional history of reflectance values, from which black-white threshold decisions are made, is stored in a relatively small amount of memory. Updating of the history by non-linear functions is accomplished through the use of look-up tables.
    Type: Grant
    Filed: November 19, 1980
    Date of Patent: August 17, 1982
    Assignee: International Business Machines Corporation
    Inventors: Robert C. Melamud, James D. Nihart, James M. White