Patents by Inventor Markham D. Ahn

Markham D. Ahn 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: 5046741
    Abstract: A golf mat which includes a playing surface supported at a nonzero angle with respect to the ground. In specific embodiments, the playing surface includes artificial turf with an irregular contour. A tee is provided for maintaining a golf ball in an elevated position. The support of the playing surface is provided by a base which lies on the ground and a pivotal supporting apparatus supported by said base and attached to the playing surface. The pivotal supporting apparatus may be adapted for rotary engagement with the base, adapted for maintaining the playing surface in a fixed nonzero angle with respect to the base, and/or adapted for adjusting the elevation between the base and the playing surface.
    Type: Grant
    Filed: April 16, 1990
    Date of Patent: September 10, 1991
    Inventor: Markham D. Ahn