Patents by Inventor David Oldford

David Oldford 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).

  • Tree transplanter with detachable pairs of blades
    Patent number: 5791269
    Abstract: A conical tree transplanter is formed of first and second pairs of opposed tapered blades loosely connected sequentially side by side to form a cone having a narrow end and a wide end. The first pair of opposed tapered blades is removable from the second pair of opposed tapered blades by movement in the direction from the narrow end towards the wide end of the cone and is supported by the second pair of opposed tapered blades against movement from the wide end to the narrow end of the cone. A connector is located on each of the tapered blades at the wide end of the cone for connection to a lifting apparatus.
    Type: Grant
    Filed: July 11, 1996
    Date of Patent: August 11, 1998
    Inventor: David Oldford