Appeal 2007-1800
Application 10/206,235
The Appellants claim a tempered glass having a curved shape and
used as a window glass for automobiles which comprises a compressive
stress layer having a peripheral portion with a minimum thickness within a
specified range of values. Further details regarding this tempered glass are
set forth in representative claims 1 and 2 which read as follows:
1. A tempered glass having a curved shape and used as a window
glass for automobiles, comprising:
a compressive stress layer; and
a tensile stress layer formed inside the compressive stress layer,
wherein 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, the tempered glass has a thickness (t) between 1.5 and 3.5 mm, and
the minimum thickness (a) of the compressive stress layer in a direction of
glass thickness is equal to or greater than 10% and less than or equal to 17%
of the thickness (t).
2. The tempered glass according to Claim 1, wherein the relation
between the thickness (t) and an average thickness (b) of the compressive
stress layer satisfies 0.15 ≤ b/t ≤ 0.25.
The references set forth below are relied upon by the Examiner as
evidence of obviousness:
Hashemi US 5,525,138 Jun. 11, 1996
Yoshizawa US 5,972,513 Oct. 26, 1999
Kaneko US 6,107,360 Aug. 22, 2000
Claims 1, 2, 4, 6, 7, and 16-19 are rejected under 35 U.S.C. § 103(a)
as being unpatentable over Yoshizawa in view of Hashemi, and claims 8-15
2
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