Appeal No. 95-4152
Application 08/042,044
different uses taught for Hanson's system at col. 15, line 39)
had sufficient knowledge and common sense both to recognize
the problem that the camera and display would be exposed to
high temperatures and flames and the solution of using fire
protective insulated jackets.
Claim 23 -- Hanson, Hamilton, and Eckstein
Claim 23 recites that the camera is mounted in a position
to be cooled by the exhalation gas of an exhalation valve on a
facepiece. The examiner applies Hamilton as showing an open
loop breathing system connected to a faceplate and Eckstein as
teaching the use of the exhaled gas to cool the outer housing
of a heated cartridge. Appellants argue that the combination
is mere hindsight (Br31-32). We agree with appellants.
Eckstein is a closed loop system that recycles exhaled air
over a regenerative cartridge 5. There is no suggestion in
Hamilton or Eckstein of using exhaled gas from an open loop
system to cool an external component. The examiner has failed
to establish a prima facie case of obviousness. The rejection
of claim 23 is reversed.
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