Patents by Inventor Dustin C. Clark

Dustin C. Clark 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).

  • Spiral climb in surrounding enclosure
    Patent number: 6108988
    Abstract: A modular spiral staircase within a surrounding enclosure for indoor playground equipment is disclosed. The modular spiral staircase includes individual stair treads arranged in a spiral pattern within the surrounding enclosure. The individual stair treads are vertically connected to one another and are circumferentially connected to the surrounding enclosure. Preferably, arcuate tread segments each having a plurality of integrally connected individual stair treads are provided. The individual stair treads are laterally offset from each other and are circumferentially arranged in a spiral pattern about an associated supporting central post. The surrounding enclosure includes enlarged spaced lower and upper openings that are aligned with the modular spiral staircase to facilitate entry and exit of a user.
    Type: Grant
    Filed: December 7, 1998
    Date of Patent: August 29, 2000
    Assignee: Soft Play, L.L.C.
    Inventors: Keith C. Nagelski, Dustin C. Clark, Grant M. Strawcutter