Appeal 2007-0694
Reexamination Control 90/006,433
Patent 5,428,933
13) As to the implicit manufacturing process variation, Mr. Philippe
testifies that a block formed with foamed material will generally shrink by
about 1.0 % to about 2.0 % as it cures. (Philippe Dec., ¶ 4).
C. Prior Art
1. Guarriello, U.S. Patent 5,123,222
14) Guarriello is directed to a hollow foamed plastic form for concrete
that has a pair of opposed side walls where the upper and lower faces of the
side walls contain a series of elongated locking members. (Guarriello,
Abstract).
15) Guarriello teaches that construction using modular hollow plastic
units that are then filled with concrete has gained wide acceptance. (Id. at
col. 1, ll. 12-15).
16) Guarriello states that a “number of approaches” to modular hollow
plastic units have already been described, including the use of projections
and recesses on the upper and lower edges of the side walls for interlocking
several of the forms. (Id. at col. 1, ll. 17-18 and 23-28).
17) Guarriello Figure 8, depicted below, is a plastic form that permits
communication of concrete between two abutting forms:
8
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