Appeal No. 1996-3195 Page 2
Application No. 08/228,086
preparation thereof, and a fabric that is impervious to
liquids. The seam comprises a laminate sheet of a polyester
fabric with a polyurethane coating on one side thereof. An
understanding of the invention can be derived from a reading
of exemplary claims 1, 8, 15, and 27 which are reproduced
below.
1. A stitchless seam that is impervious to liquids, the
seam comprising:
a laminate sheet constructed solely of a polyester fabric
on one side of the sheet and a polyurethane coating over the
polyester fabric on a second side of the sheet, the sheet
having at least one pair of opposite edges;
the sheet being formed in a tube configuration with the
polyester fabric extending around an interior of the tube and
the polyurethane coating extending over an exterior of the
tube;
the pair of opposite edges being folded back into the
tube interior where the edges are aligned adjacent each other
in the interior of the tube and the polyurethane coating on
each of the opposite edges being in mutual contact, and
wherein the polyurethane coating on each of the opposite edges
has been ultrasonically welded securing the edges together and
forming a seam along the tube of laminate sheet that both
joins the opposite edges of the sheet together and seals the
join of the edges solely by the ultrasonically welded
polyurethane coating.
8. A method of forming a stitchless seam that is
impervious to liquids, the method comprising:
constructing a laminate sheet from a piece of polyester
fabric, the fabric having a configuration with at least one
pair of opposite edges, and covering over one side of the
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