1.919—Filing date of request for inter partes reexamination.
        
        (a) 
         The filing date of a request for inter partes reexamination is the date on which the request satisfies all the requirements for the request set forth in  § 1.915.
    
    
        
        (b) 
         If the request is not granted a filing date, the request will be placed in the patent file as a citation of prior art if it complies with the requirements of  § 1.501.