Appeal No. 1999-2108 Page 4
Application No. 08/654,371
for example, Uniroyal, Inc. V. Rudkin-Wiley Corp., 837 F.2d
1044, 1052, 5 USPQ2d 1434, 1052 (Fed. Cir.), cert. denied, 488
U.S. 825 (1988).
The appellants’ invention is directed to a method of
manufacturing a print head of the type having a plurality of
ink pressure chambers defined by adjacent walls and having a
top bonded onto the top surfaces of the walls. According to
the appellants, in the prior art the adhesive for bonding the
cover to the top surfaces of the chamber walls was applied by
placing a mask across the top surfaces of the walls and then
moving a bead of adhesive in a direction parallel to the length
of the walls defining the chambers by means of a squeegee.
This gave rise to several problems, including variations in the
thickness of the adhesive and leakage of the adhesive into the
pressure chambers during installation of the cover. Briefly
stated, the appellants discovered that these problems could be
eliminated by applying the adhesive by moving the squeegee in a
direction essentially only perpendicular to directions in which
the walls extend (independent claims 1, 10 and 11), and by
making the end walls that define the chambers of a greater
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