Appeal No. 96-2477
Application 08/345,292
the teachings of Henrichsen or Sanders in Hall, we believe that
the ordinarily skilled artisan would have aligned the tractor and
pusher propeller along a common axis, as taught by Henrichsen and
Sanders, for the self evident advantages such an arrangement
provides, such as, the redundant safety of dual engines with
reduced off-axial mass and thrust.
Regarding the requirement of claim 1 that the housing of the
propulsion module comprises a housing with only two engines and
that said module is adapted to be installed as the only
propulsion means of the aircraft, the provision of only two
propulsion engines in Hall’s flight component A is considered to
be an obvious matter of engineering choice to one of ordinary
skill in the art dependent upon design factors such as the amount
of thrust desired. As to the requirement of claim 7 that the
tractor propeller and pusher propeller be located respectively
forward and aft of the leading and trailing edges of the wing
means, it is our view that the ordinarily skill artisan would
have recognized this arrangement as being the most
straightforward design approach in applying the aligned tandem-
engine teachings of Henrichsen and Sanders in Hall. In any
event, Sanders discloses such an arrangement.
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