Ex Parte Darlet - Page 20


                Appeal 2007-0224                                                                                  
                Application 09/754,785                                                                            
                never ruled that methods without any transformation are eligible, and                             
                appears in Schrader to have rejected that proposition.                                            
                       We believe that “process” should not be broadened so as to include                         
                any and every method that may be deemed useful.  The Supreme Court’s                              
                and Federal Circuit’s articulated eligibility tests keep the interpretation of                    
                “process” in pari materia with the other three categories of inventions –                         
                manufacture, machine, and composition of matter.  In other words,                                 
                interpreting “process” as either transforming subject matter or implemented                       
                by one of the other three categories of inventions is rationally consistent                       
                with and proportional to the types of inventions patented under the other                         
                categories.5  See Tilghman v. Proctor, 102 U.S. 707, 722 (1880) (“where the                       

                                                                                                                  
                implemented process, not involving any transformation, might be patentable.                       
                The answer to that question is still provided by Schrader, and that answer, so                    
                far, is negative.  While AT&T indicated that Schrader is “unhelpful” because                      
                it did not reach the question whether a “useful, concrete, and tangible result”                   
                occurred, the reason that case did not need to reach that question was                            
                because it found that Schrader’s method claims were unpatentable for lack                         
                of any transformation.  In addition, Schrader’s claims did not require                            
                machine-implementation, unlike AT&T’s claims.  See AT&T, 172 F.3d at                              
                1358, 50 USPQ2d at 1452 (“AT&T’s claimed process” uses “switching and                             
                recording mechanisms to create a signal useful for billing purposes.”).                           
                Moreover, it is axiomatic that dicta in one Federal Circuit panel decision                        
                cannot overrule the holding of an earlier panel decision.  George E. Warren                       
                Corp. v. United States, 341 F.3d 1348, 1351 (Fed. Cir. 2003) (“We cannot                          
                simply overrule [a prior panel] decision, even if we were persuaded . . . that                    
                it is appropriate; to overrule a precedent, the court must rule en banc” (citing                  
                Newell Cos. v. Kenney Mfg. Co., 864 F.2d 757, 765, 9 USPQ2d 1417, 1423                            
                (Fed.Cir.1988)).                                                                                  
                5      We do not propose in this decision a comprehensive rule for defining                       
                patentable subject matter in all circumstances.  Rather, this decision                            

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