Appeal No. 1996-3582
Application No. 07/828,083
The claims on appeal are directed to multi-layered
medical grade tubing including two layers which are each
composed of particular polymer blends which do not include PVC
or DEHP. According to appellants’ specification, the claimed
product
possesses essential characteristics required for use as
medical grade tubing while not having disadvantages associated
with use of DEHP-plasticized PVC tubing. Claim 1, the sole
independent claim, is illustrative of the subject matter on
appeal:
1. A medical grade tubing comprising a multilayer
coextruded structure that does not include PVC or DEHP
including a layer comprising a blend of polyurethane and
polyester, a tie layer and at least a layer comprising a blend
chosen from the group consisting of: polypropylene,
ethylenevinyl acetate, and polyurethane; polypropylene and
styrene-ethylene-butylene-styrene; polypropylene, styrene-
ethylene-butylene-styrene, and ethylenevinyl acetate;
polypropylene, ethylenevinyl acetate, styrene-ethylene-
butylene-styrene, and thermoplastic polyester elastomer;
polypropylene, ethylenevinyl acetate, styrene-ethylene-
butylene-styrene, thermoplastic polyester elastomer, and
polyurethane; polyester, thermoplastic polyester elastomer,
and polyurethane; polyurethane and polyester; and
polypropylene, styrene-ethylene-butylene-styrene, and
polyurethane.
The sole reference relied upon by the examiner under
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