Appeal No. 1998-2933
Application 08/439,082
This is a decision on appeal under 35 U.S.C. § 134 from
the final rejection of claims 1, 2, 4-6, and 8-21.
We reverse but enter a new ground of rejection.
BACKGROUND
The disclosed invention relates to a keyless security
system for a vehicle in which a vehicle-mounted receiver unit
is switched from a power-saving periodic activation mode to a
continuous activation mode when valid control signals are
transmitted from a portable transmitter unit. The admitted
prior art system, figures 7 and 8, utilizes a complicated and
costly electric field detector to detect transmitted signals
and switch to the continuous active mode. The invention uses
idling information (either a plurality of bits of only logical
one or logical zero or a plurality of Manchester code signals)
preceding the data information, which idling information is
detected to indicate the transmitted remote control signal and
allows elimination of the electric field detector.
Claim 1 is reproduced below.
1. A keyless security system for a vehicle, the keyless
security system comprising:
a portable transmitter for transmitting a
predetermined remote control signal which contains idling
information, wherein said idling information is composed
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