Patents Assigned to Callison & Associates XXI, Inc.
  • Patent number: 5283994
    Abstract: A modular landscape timber system used generally to construct retaining walls and boxed gardens having a plurality of vertically aligned layers of modular first members having ends with ball and socket joint portions that interfit with one another, a plurality of braces, and a plurality of spikes that are driven through the braces on an incline to fasten the ends of the timber members together with a resulting joint that resists rotational movement. The system further includes a deadman joint that serves to maintain the vertical alignment of the layers of first members.
    Type: Grant
    Filed: June 19, 1992
    Date of Patent: February 8, 1994
    Assignee: Callison & Associates XXI, Inc.
    Inventor: Douglas A. Callison