Appeal No. 1998-1915 Page 6
Application No. 08/670,123
at 10.)
Claims 11-18 specify in pertinent part the following
limitations: "supply a first alternating-current electric
power to the discharge lamp during a time interval immediately
after activation of the discharge lamp, ... supply a second
alternating-current electric power to the discharge lamp after
the time interval elapses; wherein the second alternating-
current electric power has a frequency higher than a frequency
of the first alternating-current electric power."
Accordingly, the claims require supplying a low frequency AC
power to a discharge lamp immediately after the lamp is
activated and, after a time, supplying a higher frequency AC
power to the lamp.
The examiner fails to show a teaching or suggestion of
the limitations in the prior art. Although Yamashita
discloses supplying a low frequency "AC voltage of a
rectangular waveform", col. 4, ll. 64-65, to a discharge lamp
and, after a time, supplying a higher frequency AC voltage of
a rectangular waveform thereto, the low frequency waveform is
Page: Previous 1 2 3 4 5 6 7 8 9 10 11 12 Next
Last modified: November 3, 2007