Appeal No. 1999-1332
Application No. 08/591,857
relatively hard, air impermeable frame is provided, and an
edge of the filter pack 22 is immersed in the liquid (see, for
example, Figure 3). The liquid is permitted to set to thereby
form a relatively hard, air impermeable frame side. The
filter pack is then turned and the process repeated to form
the other sides of the frame.
Wasielewski, the secondary reference in each of the
rejections, is directed to a method of fabricating an air
filter comprising a filter core and a box-like frame usually
made of plywood, heavy cardboard, or sheet metal (column 1,
lines 25-27). The method of fabricating is described at
column 3, line 19, through column 4, line 36. In Wasielewski,
strips 34 and 36 are secured to end plate 24 by convenient
means such as staples (column 3, lines 22-27), whereafter
temporary walls are then formed along the front and rear edges
of the end plate with convenient, expendable materials such as
two strips of pressure-sensitive tape to form a shallow pan-
like structure (column 3, lines 33-44). A liquid adhesive 48
is then poured into the pan-like structure (column 3, lines
44-48). A core subassembly comprising a filter core 12 having
7
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