Appeal No. 96-1476
Application 08/186,515
that claims 3 and 7 are currently objected to as depending
from a rejected
claim, but otherwise allowable. Therefore, claim 5 would have
the same status since it depends from claim 3. Claim 2 has
been canceled.
The invention relates to a spark plug with a built
in pressure sensor, which is suitable for use in an internal
combustion engine. At page 10 et seq. of the specification
and Figure 1, Appellants disclose the spark plug 1 with a
built in pressure sensor 12. The metal shell 8 has a threaded
portion 10 for mounting the spark plug 1 on the cylinder head
21 of an internal combustion engine. A slit 13 is formed as a
pressure introducing channel, along an axis of the plug 1, in
the threaded portion 10 of the metal shell 8. Slit 13 allows
combustion gas to flow to pressure sensor 12.
The independent claim 1 is reproduced as follows:
1. A spark plug with a built-in pressure sensor,
said spark plug being suitable for use in an internal
combustion engine, wherein the pressure sensor is built in a
mounting base of a metal shell in a direction to convert a
variation in a tightening load of said spark plug on a
cylinder head of said internal combustion engine into an
electrical signal, said metal shell being provided with at
2
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Last modified: November 3, 2007