Appeal No. 95-0143
Application 07/865,849
lock are retrofitting existing safes locks, house door locks and
hotel room door looks. These retrofit applications present the
same problems that Clark has solved in that it is not convenient
to provide a power supply for these existing locks when retro-
fitting these locks with the Todd system. Therefore, we find
that those skilled in the art would have found it desirable to
use the Clark system of providing the power from the power supply
provided in the key in the Todd system in order to solve the
problem of providing power to the lock.
Appellants further argue on pages 17 and 18 of the brief
that Todd’s applications are convenient to provide power to the
lock. We disagree. Todd teaches, as pointed out above, that the
application is for retrofitting mechanical locks in safes, house
doors and hotel room doors. Under these conditions, there is not
a convenient way to provide power to the lock.
Appellants argue that Todd teaches away from the proposed
modification because Todd teaches powering the key from a battery
in the lock. However, we do not find that this teaching by
itself teaches to those skilled in the art to power the lock from
a power source in the lock as the only way to provide power.
Todd does not teach that it would not be just as advantageous to
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