Appeal No. 97-3673
Application No. 08/251,125
Before THOMAS, HAIRSTON, and KRASS, Administrative Patent
Judges.
KRASS, Administrative Patent Judge.
DECISION ON APPEAL
This is a decision on appeal from the final rejection of
claims 1 through 10, all of the claims pending in the
application.
The invention is directed to electronic ballasts for gas
discharge lamps and, more particularly, to electronic ballasts
having a controlled DC supply voltage.
Representative independent claim 2 is reproduced as
follows:
2. An arrangement comprising:
an inverter circuit having: (i) DC terminals connected
with a DC supply voltage and operative to draw DC input power
therefrom, the magnitude of the DC supply voltage being
substantially unaffected by the amount of power drawn
therefrom; and (ii) AC terminals across which exists an AC
output voltage, the magnitude of the AC output voltage being
substantially proportional to the magnitude of the DC supply
voltage;
an L-C circuit having an inductor means and a capacitor
means effectively series-connected across the AC terminals,
thereby giving rise to resonant action such as to cause an
alternating current to be drawn from the AC terminals and a
ballast output voltage to develop across the capacitor means;
the capacitor means being connected with a pair of ballast
2
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