. . "ation shall, within 2 months from the date of the Registrar???s letter forwarding such copies to him, file a counter-statement on Patents Form 3 setting out fully the grounds of his opposition, and the Registrar shall send a copy of the counter-statement to each of the persons described in this rule other than any person who is party to the counter-statement. (4) The Registrar may give such direct" . .