Patents by Inventor Linelle R. Johnson

Linelle R. Johnson 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).

  • Filter media for preventing carbon migration
    Patent number: 5980616
    Abstract: A filter includes a center layer of carbon cloth interposed between two layers of filter material whose edges are welded together to provide not only a filter edge substantially free of carbon particles, but also an effective barrier to the migration of carbon particles from the filter's interior to its exterior. A filter pouch, encapsulating the carbon filter, includes a layered structure welded together proximate its edges. The filter pouch is also suitable for use with a desiccant filter.
    Type: Grant
    Filed: August 15, 1997
    Date of Patent: November 9, 1999
    Assignee: Donaldson Company, Inc.
    Inventors: Linelle R. Johnson, Gary L. Butler, Thomas J. Bachinski