Patents by Inventor Allie Callahan

Allie Callahan 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).

  • Lawn edging machine
    Patent number: 4312178
    Abstract: A balanced self-propelled and manually guided lawn edger is disclosed in which an edging cutter blade is positioned near the inner side and rearwardly of the larger of two traction wheels of unequal diameters on a common drive axle. The smaller traction wheel can be axially adjusted relative to the larger wheel to regulate the angle of cut adjacent to a side wall or curbing.
    Type: Grant
    Filed: January 19, 1981
    Date of Patent: January 26, 1982
    Inventor: Allie Callahan