Patents by Inventor William C. Chedister

William C. Chedister 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).

  • Card with magnetic stripe and method for testing magnetic inspection particle fluid
    Patent number: 6310471
    Abstract: A magnetic stripe card provides a quantitative tool for the measurement of magnetic sensitivity for fine-grained iron, iron oxide or other ferro-magnetic powders, that may be used for magnetic particle inspection and other purposes. The magnetic stripe card is encoded to establish distinct areas on the magnetic stripe. Each distinct area has a specific magnetic gradient. Ferro-magnetic powders are attracted to the gradient in proportion to the value of the gradient. A higher gradient more strongly attracts the powder. A determination of the sensitivity of the powder can be ascertained by observing the gradient with the lowest value to which the powder is attracted.
    Type: Grant
    Filed: September 7, 1999
    Date of Patent: October 30, 2001
    Assignee: Circle Systems, Inc.
    Inventor: William C. Chedister