Appeal No. 2004-1332
Application No. 10/010,691
signals and a controller 40, responsive to a plurality of control
signals, for activating the pump based on a statistical analysis of
control signal timing. This appealed subject matter is adequately
represented by independent claim 1 which reads as follows:
1. A demand hot water recirculation system comprising:
a hot water source;
at least one plumbing fixture having a hot water inlet;
a conduit, in fluid communication with said hot water source
and the plumbing fixture hot water inlet, for enabling circulation
of hot water from said hot water source to the plumbing future
[sic, fixture] and return to said hot water source;
a pump for circulating hot water through the conduit;
a switch for generating control signals; and
a controller, responsive to a pluralilty of control signals,
for activating said pump based on a statistical analysis of control
signal timing.
The references set forth below are relied upon by the Examiner
as evidence of obviousness:
Barrett et al. (Barrett) 4,870,986 Oct. 3, 1989
Houlihan 5,775,372 July 7, 1998
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