Ex parte ASCHENBECK et al. - Page 5

               Appeal No. 1998-0241                                                                        Page 5                 
               Application No. 08/465,373                                                                                         

               and related fiberizing techniques disclosed in [U.S. Patent No. 5,431,992 issued to Houpt et al.                   
               on July 11, 1995]."  The Houpt et al. patent (column 7, lines 38-43) teaches that                                  
                      [a]n irregularly shaped fiber of the invention differs from a helical fiber in that                         
                      the rotation of the fiber is not constant, but rather varies irregularly both in                            
                      direction (clockwise and counterclockwise) and in magnitude.  The magnitude of                              
                      rotation of a fiber is how fast the fiber rotates per unit length of the fiber.                             
               As disclosed in column 7, lines 17-37 and 57-64, the irregularly shaped fibers of the Houpt et                     
               al. patent are produced by forming each fiber of two different glass compositions each having a                    
               different coefficient of thermal expansion, thereby causing the fiber to curve as it cools.  If no                 
               rotation of the fiber is introduced during cooling, a flat coil having a constant radius of                        
               curvature will be produced.  In a continuously changing attenuation environment, each dual-                        
               glass fiber is twisted in a unique way.  The fiber's final shape is one with a baseline curvature                  
               due to the dual-glass nature, which is modified by the twisting, irregular rotation of the plane of                
               curvature caused by the continuously changing or stochastic attenuation environment.                               
                      The appellants’ specification has been amended (Paper No. 9) by insertion of the                            
               following language on page 13:5                                                                                    
                      An irregularly shaped glass fiber 122 is shown in Figure 7, where the shadow                                
                      124 of the irregularly shaped fiber cast from an overhead light onto a flat surface                         
                      has been added.  The irregularly shaped glass fiber comprises two distinct glass                            
                      compositions with different coefficients of thermal expansion.  An irregularly                              
                      shaped glass fiber has a rotation which is constant, but varies irregularly both in                         

                      5We also note that the appellants have filed a request for drawing correction (Paper No. 14) to add new     
               drawing Figures 6 and 7.  It is not clear from the file record whether the examiner has approved entry of these    
               drawings.  We leave this to be resolved by the examiner, in the event of further prosecution.                      

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