Appeal 2007-1800
Application 10/206,235
(2) Hashemi discloses optimizing the strength of tempered glass by
providing a compressive stress layer thickness which is a certain
percentage of the glass sheet thickness (col. 2, ll. 33-48).
(3) Hashemi’s afore-noted compressive stress layer thickness is related to
the glass composition and thickness (col. 3, ll. 28-34; col. 5, ll. 43-46).
(4) For a particular glass composition of 3.8 mm thickness, Hashemi
teaches that the optimal compression layer (i.e., compressive stress
layer) thickness is about 18-20% of the total glass thickness (col. 6, ll. 5-
16 and 39-42).
(5) Hashemi discloses that his teachings would enable those skilled in the
art to determine the percent compression layer thickness for glass sheets
having other compositions and thicknesses (col. 6, ll. 20-26; col. 7, ll.
25-30).
Claim Construction
Claim 1 recites “the compressive stress layer has a peripheral portion
in which the minimum thickness (a) of the compressive stress layer is from
0.15 to 0.7 mm.” This language might be interpreted as defining a minimum
thickness value which excludes compressive stress layer thicknesses of
lesser value and includes compressive stress layer thicknesses of greater
value. However, at the oral hearing of July 10, 2007, Appellants’
representative indicated that the recitation should be interpreted as requiring
a compressive stress layer with a minimum thickness which is literally
within the claim 1 range.
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