Ex Parte Clark - Page 3




         Appeal No. 2003-0470                                                  
         Application 09/671,870                                                


                  As can be seen from appellant’s specification, an            
         arrangement for carrying out the above-noted method (e.g.,            
         Figure 3A) includes a flow mixing device which appellant has          
         characterized as “an unsteady flow ejector.”  The unsteady            
         flow ejector (10) includes a multi-blade rotor (30) which is          
         disposed in a primary exhaust flow of the jet propulsion              
         engine and rotates in response to a transfer of momentum              
         from the engine core flow.  The specification indicates that          
         rotation of the rotor (30) in the primary exhaust flow                
         generates a plurality of rotating high velocity, low density          
         jets (32) and a plurality of rotating low pressure voids              
         (34), with each of the voids being spaced between two of the          
         jets.  An example of the rotor (30) is shown in Figure 2A of          
         the application drawings and includes a plurality of blades           
         (40) affixed to a hub (42).  Appellant notes (specification,          
         page 7) that in the example shown, the rotor has four blades          
         (40), with the rotor face angle being about 60° and having            
         an open area ratio for the jets (32) of about 33%.  The               




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