Appeal No. 95-3849
Application 08/029,549
This is a decision on appeal under 35 U.S.C. § 134 from
the final rejection of claims 1-6.
We reverse.
BACKGROUND
The disclosed invention is directed to a magnetic tape
guide having a roughened surface which reduces frictional
resistance due to humidity.
Claim 1 is reproduced below.2
1. A magnetic tape guide apparatus, comprising:
a guide member having a cylindrical profile for
guiding a magnetic tape along a magnetic tape guide face
provided by an outer circumferential face thereof, said
magnetic tape guide face being formed as a roughened face
wherein the height * of crests is selected within the
range of 0.2 µm to 3.0 µm and the pitch x of the crests
is selected so that it satisfies 0.050 mm # x # (329*)0.25
mm.
We question the derivation of the expression for2
pitch x in terms of * in the specification at pages 37-38. In
Marks' Standard Handbook for Mechanical Engineers
(McGraw-Hill, Inc. 9th ed. 1987), page 5-24 (copy attached),
the expression for maximum displacement for a uniformly loaded
beam fixed at the ends is f(max) = Wl /EI384 or *max =3
wx /EI384 using appellants' notation. The specification uses3
*max = wx /384EI (page 37), which requires *max to be4
dimensionless. This causes a discrepancy in the use of the
term * in claim 1 because the limitation of "the height * of
crests is selected within the range of 0.2 µm to 3.0 µm"
requires * to be a dimension measured in microns (µm). It is
noted that "max" in the derivation of equation (7) at page 38
of the specification should be "*max."
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