Patents by Inventor by Dorothy H. McDonald, administratrix

by Dorothy H. McDonald, administratrix 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).

  • Patent number: 4134600
    Abstract: Roller ski apparatus for supporting a rider on pavement or the like comprising a foot-supporting platform equipped at its opposite ends with skate-type wheel units and a resilient suspension device. The suspension device provides the rider with a smooth glide-like ride closely simulating that experienced in skiing on snow. Control handles pivotally connected to the sides of the platform aid the rider in maintaining balance and in shifting his weight to activate the steering capabilities of the wheel units which have limited swiveling properties. One embodiment includes separate foot-supporting members supported on a common frame for independently pivotable movement about their own longitudinal axis and spring biased to a neutral coplaner position. The apparatus may comprise a single foot-supporting platform or a separate platform for each foot, but each construction embodies a spring suspension for the rearmost wheel unit.
    Type: Grant
    Filed: April 25, 1977
    Date of Patent: January 16, 1979
    Inventors: Benjamin J. McDonald, deceased, by Dorothy H. McDonald, administratrix