Appeal No. 97-0519
Application 08/291,719
also does not teach or suggest an arrangement wherein an
appara- tus location providing means like that of claim 18
would include "a visual indicating means," which latter means
includes "an outer surface of said device comprising
luminescent material," as in dependent claim 19 on appeal.
However, we note that Dosch discloses a portable emergency
breathing apparatus wherein the apparatus includes one or more
chemiluminescent elements (64) connected thereto to assist in
donning of the breathing apparatus particularly in the dark,
and which chemiluminescent elements are later used for
assisting in finding the wearer by rescue person- nel. Based
on the collective teachings of Hall and Dosch, it is our
opinion that it would have been obvious to one of ordinary
skill in the art at the time of appellant’s invention to
provide the emergency breathing apparatus of Hall with
chemiluminescent or luminescent elements as generally
suggested in Dosch so as to provide the user of Hall’s
breathing apparatus with assistance in donning the apparatus
in the dark and also with a visual indicat- ing means that
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