Patents by Inventor Edwin Wikfors

Edwin Wikfors 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).

  • Retention time stability in a gas chromatographic apparatus
    Patent number: 5476000
    Abstract: The effect of barometric pressure variation on the retention time stability of a chromatographic analytical system is compensated by active control of the amount of fluid flow by way of a fluid flow controller, preferably in the form of an electronic pressure control system. Control signals are derived by: receiving data representative of a desired operating condition parameter, such as column inlet pressure; sensing actual operating condition parameters such as inlet pressure p.sub.i and barometric pressure p.sub.
    Type: Grant
    Filed: March 31, 1994
    Date of Patent: December 19, 1995
    Assignee: Hewlett-Packard Company
    Inventors: Robert Henderson, Edwin Wikfors