Narrow use codes can also lead to failures by generic drug companies to carve-out critical label information. 
                             
                            
                            
                         
                        
                        
                     
                        
                            
                                
                            
                            
                            
                                Drug maker’s decision to list auto-injector patent was not unreasonable when FDA had declined to answer seven industry letters asking whether a drug delivery device patent could be listed in Orange Book.