Appeal No. 1998-2841
Application No. 08/463,282
BACKGROUND
The invention is directed to a remote control security system for an automobile; in
particular, a remote control transmitter and receiver. Claim 1 is reproduced below.
1. In a remote control security system for an automobile, comprising a remote
control unit, a receiving unit, and an operation unit connected to said receiving unit;
said remote control unit emitting a combination code signal and said receiving unit
receiving said combination code signal so as to control operation of said security
system:
wherein said remote control unit includes a keyboard, an encoder and a
signal emitter; said encoder produces a combination code corresponding to said
combination code signal according to a signal from said keyboard, and said
combination code is transmitted by said signal emitter;
wherein said receiving unit includes a receiver and a decoder; said receiver
1
receiving the combination code signal sent by said emitting means of said remote
control unit and said decoder including means for comparing said a received
combination code decoded from said combination code signal with a combination
code produced by said decoder; and
wherein if the received combination code matches the combination code
produced by the decoder, a control signal is transmitted to said operation unit to
control operation of the security system,
the improvement wherein the combination code comprises a fixed
combination code and two variable remedy codes, and said encoder and decoder
each includes means for sequentially varying a first of the remedy codes once each
time a key on said keyboard is pressed, and for sequentially varying a second of
the remedy codes constantly between a time that said key is pressed and a time
that said key is released.
1Since there is no “emitting means” previously set forth in the claim, the recitation should be
changed to “said signal emitter” to avoid a lack of proper antecedent.
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