Appeal No. 1996-4073
Application No. 08/345,917
This is a decision on appeal from the final
rejection of claims 31 through 33 . 2
The invention is directed to a linear opto-coupler
circuit that is used to electrically isolate one circuit from
another. As shown in Figure 1, linear opto-coupler 12
includes a light emitting diode 13 and a detector diode 18 to
linearize the circuit, which is connected to an input circuit
including amplifier 19. The output circuit has photo detector
17 for optical isolation. In particular, referring to Figure
6 for the details of light emitting diode 13 and detector
diode 18, an epitaxial layer 43 is formed on a planar side of
semiconductor substrate 40. Epitaxial layer 43 forms an anode
of light emitting diode 41. A terminal 48 couples to
epitaxial layer 43. Semiconductor substrate 40 forms a
cathode of light emitting diode 41. On a planar side opposite
from which epitaxial layer 43 is formed, an epitaxial layer 44
2 The brief misstated the finally rejected claims as
claims 30 through 32. This misstatement was repeated in the
answer. However, paper no. 17, received Aug. 28, 1995,
canceled claims 21 through 29 and 34 through 38, leaving
claims 30 through 33 as the remaining pending claims. Of
these remaining claims, claim 30 is directed to a non elected
invention, and not included in this appeal.
2
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