Patents by Inventor Douglas E. Whitt

Douglas E. Whitt 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).

  • Soil moisture tube extraction device
    Patent number: 5072981
    Abstract: A versatile device is provided for securely gripping the outer surface of a cylindrical object and pulling it against a resistant force comprising a sleeve that fits around the cylindrical object and engages its outer surface with gripping jaws when a pulling force is applied. The extractor enables efficient and economical extraction of soil access tubes without tube damage. The device can be operated either with large power equipment or with a manual jack.
    Type: Grant
    Filed: October 26, 1990
    Date of Patent: December 17, 1991
    Assignees: The United States of America, as represented by the Secretary of Agriculture, Colorado State University Research Foundation
    Inventors: Barry A. Weaver, Douglas E. Whitt