Appeal No. 1997-2162
Application 08/280,430
failure. Appellants on pages 15 and 16 add that Shah and
Grove are concerned with safety problems associated with
elevators and not mobile lifting devices and thus provide no
suggestion to combine such teachings with Gary’s mobile lift.
The Examiner on page 7 of the answer responds to
Appellants’ arguments by pointing out that the scope of the
claim is such that the DC powered circuits are not limited to
those circuits that are powered only by DC power or low DC
power. The Examiner further states that the safety switches
used in both elevators and mobile lifts are similar as
disclosed by Gary in col. 6, lines 2 and 3.
We find that Shah in col. 5, lines 50 through 67 teaches
first and second control circuits 254 and 256 for raising and
lowering the lift powered by AC current from the transformer
70. The relays 276 and 282 are controlled by the “DOWN” and
the “UP” circuits respectively. Additionally, DC power is
taught in col. 6, lines 61 through 66 to be generated by
converters 259 and 261 and supplied to the microcomputer 246.
Grove in col. 4, lines 31 through 37 and lines 58 through 68
discloses a battery charger 62 connected to a portion of the
control circuit, particularly, to the battery 64 and the
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