Appeal No. 1999-0635 12
Application No. 08/688,825
purposes of ventilation and which will at the same time
prevent intrusion. It is important to Warfel that the screen
serves as a barrier and cannot be detached from the outside.
(page 1, lines 8-22). The door screen (3) embodies a pair of
overlapping sections (4,5) each provided with a frame and a
panel (6), which may be of wire-mesh or of fabric to allow air
to pass therethrough. The frames are slidably connected by
means of U-shaped clips (7). The screen is further provided
with means for attaching the screen to the door knob of the
door and to the door casing.
The examiner concedes that Warfel does not disclose the
extensible doorway barrier as comprising an open mesh attached
to and stored on a reel, but contends that to use the open
mesh material (7) of Hutchinson "in lieu of the extensible
doorway [barrier] as disclosed by Warfel for the purpose of
substituting a mechanical equivalent for another to obtain the
advantages inherent therein, such as ease of storing the
extensible doorway barrier in a compact configuration, would
have been obvious to one of ordinary skill in the art"
(answer, page 5).
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