Appeal No. 2000-0338 Page 3
Application No. 08/624,615
Claim 9, which is representative for present purposes,
follows:
9. A device for indicating a formation of ice on
a measuring surface of an object exposed to ice
formation, said device comprising:
a sensor including a Peltier element having a
first contact surface in thermal contact with the
measuring surface and a second contact surface in
thermal contact with a reference surface within the
object at a distance from the measuring surface,
said sensor passively and continuously measuring a
temperature difference between said first and second
contact surfaces of said Peltier element; and
a signal processing device connectable to said
first and second contact surfaces of said Peltier
element for detecting a series of changes in outputs
from said sensor which occur when heat generated in
connection with the formation of ice is released by
the measuring surface.
(Appeal Br., App.)
The prior art applied by the examiner in rejecting the
claims follows:
Boschung 4,222,044 Sep. 9, 1980
Khurgin 4,882,574 Nov. 21, 1989.
Claims 9-16 stand rejected under 35 U.S.C. § 103(a) as obvious
over Khurgin in view of Boschung.
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