Patents by Inventor Craig A. James

Craig A. James 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).

  • Mass spectrometry system and method employing measurement/survey scan strategy
    Patent number: 4837434
    Abstract: A gas chromatography plus mass spectrometry system implements a scan strategy in which each full range scan alternates between a normal measurement mode and a survey mode based on a block/gap map made during the previous scan. Survey mode is used within regions that were determined in the previous scan to lack signal above a predetermined threshold. Spectral data is generated during measurement mode operation. Each scan serves both measurement and mapping functions in a way that avoids mass filter jumps, since each scan is monotonic over the entire scanning range.
    Type: Grant
    Filed: July 9, 1987
    Date of Patent: June 6, 1989
    Assignee: Hewlett-Packard Company
    Inventor: Craig A. James