Patents by Inventor William I. Liddell

William I. Liddell 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).

  • Tent structure
    Patent number: 5000211
    Abstract: A modular tent structure comprises a canopy structure (20) including a peripheral frame (23) adapted to support a covering roof sheet (24) and comprising collapsible sides, each constituted by a central crown joint structure to each side of which is pivoted a laterally extending support member (34), and a tie member releasably interconnecting the crown joint structure and the pivotally-connected laterally-extending support members (34). An axially-extendible mast structure is disposed centrally of the peripheral frame and is adjustable to vary tension in the covering roof sheet (24). Bracing means releasably interconnect the central mast structure and each central crown joint of the peripheral frame (23).
    Type: Grant
    Filed: July 17, 1989
    Date of Patent: March 19, 1991
    Assignee: Aquila Shelters Limited
    Inventors: Roger L. Speare, William I. Liddell