                                    EX-10.4
                              PATENT APPLICATION

(a)  United States Patent Application No. 10/733,806

George S. Avery, December 10, 2003

Abstract

An artificial turf is provided that resists migration of rubber infill
into the space above the turf. Artificial grass is attached to and
extends upward from a backing material, which may be one or more
layers.  The artificial grass includes groups of at least two
different kinds of fiber sewn through a common path in the backing
material.  One of the kinds of fibers is an artificial grass blade
shaped so as to appear like a blade of grass.  The other kind of fiber
in each group is pre-stressed/crimped so that the relaxed shape of the
fiber is non-linear, resembling a curlicued or articulated form having
lateral excursions.  The lateral excursions cause portions of one such
pre-stressed fiber to overlap and interfere with another, forming a
mesh.  The height of the pre-stressed fibers in their relaxed state in
the turf is less than the height of the relatively unstressed
fiber(s).  Resilient granules are embedded in the mesh, and are
captivated by the interfering pre-stressed fibers.  In one embodiment,
the pre-stressed fiber is constructed of nylon material, and the
relatively unstressed artificial grass blade of polyethylene.

