Appeal No. 2005-0233
Application 10/085,138
Representative claim 1 is reproduced as follows:
1. A three phase supervisory circuit for detecting fault
conditions in an input AC power signal, comprising:
a first sensing circuit for detecting a voltage level for a
first phase of said AC power signal and comparing said voltage
level of said first phase to a threshold value;
a second sensing circuit for detecting a voltage level for a
second phase of said AC power signal and comparing said voltage
level of said second phase to said threshold value;
a third sensing circuit for detecting a voltage level for a
third phase of said AC power signal and comparing said voltage
level of said third phase to said threshold value;
a delay circuit for delaying initial operation of said
sensing circuits for a predetermined period each time said
supervisory circuit is powered on; and
an activation circuit for receiving indication signals from
said sensing and delay circuits, said indication signals
indicative of whether said predetermined period of time has
elapsed and said voltage levels of said phases have met said
threshold value.
The examiner relies on the following references:
Holmquest 3,535,591 Oct. 20, 1970
Tran et al. (Tran) 5,224,010 June 29, 1993
Earle 5,642,052 June 24, 1997
Claims 1-18 stand rejected under 35 U.S.C. § 103(a). As
evidence of obviousness the examiner offers Holmquest in view of
Tran with respect to claims 1-7 and 11-18, and Earle is added to
this combination with respect to claims 8-10.
-2-
Page: Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 Next
Last modified: November 3, 2007