regulations 103, 104, and 161 are amended to clarify that the period for filing a counter-statement to an application for revocation of a patent may also be extended under regulation 161 in certain situations. The effect of the amendments, in summary, is that extensions will be possible under both regulations 103 and 161 in certain circumstances, and either 1 or 2 extensions are possible depending on which regulation the first extension application is made under.