Patents by Inventor Warwick Drysdale

Warwick Drysdale 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).

  • Ground engaging boundary element
    Patent number: 6643977
    Abstract: Ground engaging boundary element (10) comprises opposing edge portions and earth engaging means (26) for anchoring element (10) in the earth. Earth engaging means (26) is formed at lower edge portion (18) of element (10). At least one of the opposing edge portions includes interlocking means (22) for joining to an adjacent ground engaging boundary element. Interlocking means (22) comprises complementary-shaped tongue or groove members and extends partially along each edge portion to adjacent lower edge portion (18). In use, earth engaging means (26) together with part of interlocking means (22) is embedded in the earth, and upper portion (24) of element (10) conceals interlocking means (22). The opposing edge portions of element (10) are also shaped to permit articulation of adjacent interlocked elements so as to provide for a non-linear elongated boundary structure.
    Type: Grant
    Filed: February 12, 2002
    Date of Patent: November 11, 2003
    Inventor: Warwick Drysdale