Section 1.10008 - What are ICFS file numbers?(a) We assign file numbers to electronic applications in order to facilitate processing.(b) We only assign file numbers for administrative convenience; they do not mean that an application is acceptable for filing.(c) For a description of file number information, see The International Bureau Filing System File Number Format Public Notice, DA-04-568 (released February 27, 2004). 69 FR 29895 , May 26, 2004, as amended at 88 FR 21437 , Apr. 10, 2023