Ex Parte Chu et al - Page 4

                Appeal 2007-2566                                                                             
                Application 10/243,873                                                                       
                      radiation necessary for activating the adhesives (Specification 2:11 to                
                      3:2).                                                                                  
                 [4] Appellants' dental pin is said to be mechanically strong, opaque to X-                  
                      rays and transparent to light radiation used to activate a                             
                      photopolymerizable adhesive (Specification 3:6-11).                                    
                 [5] Appellants' dental pin is made of a composite comprising fibers                         
                      embedded in a resin matrix, wherein the fibers are radio-opaque and                    
                      the refractive index of the matrix resin is close to the refractive index              
                      of the fibers (Specification 3:12-16).                                                 
                 [6] Preferably, the refractive indices of the fibers and of the resin differ                
                      within 0.15 (Specification 11-12, original claim 5).                                   
                 [7] If the refractive index of the resin is too low vis-à-vis that of the                   
                      fibers, fillers such as amorphous silica or metal oxides may be added                  
                      to the resin (Specification 3:19 - 4:3).                                               
                 [8] If the refractive index of the resin is too high vis-à-vis that of the                  
                      fibers, the resin may be diluted in a solvent (Specification 4:3-5).                   
                 [9] Alternatively, two different resins, preferably differing by more than                  
                      0.15 in their refractive indices, may be mixed to obtain a desired                     
                      intermediate refractive index (Specification 4:6-13).                                  
                 [10] Example 1 is said to describe a dental pin made from (i) 64 % by                       
                      volume alkaline resistant synthetic fibers containing 16% radio-                       
                      opaque zirconium dioxide and having a refractive index of 1.562 and                    
                      (ii) 36 % by volume modified epoxy resin matrix having a refractive                    
                      index of 1.546 (Specification 5:6-20).                                                 




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