See ISPE Guidelines 6.04.[Art. 8(2)(a); ]
Examples of applications that cannot be recognised as a "first application" are:
In the case of US con or cip applications, the first sentence of the description reads as follows: "This application is a continuation in part (continuation) of Serial Number .... filed .....". The following information is found on the title page under the heading "CONTINUING DATA******": "VERIFIED THIS APPLICATION IS A CIP (or CON) OF ........" A form headed "Declaration for Patent Application" must also be attached to the end of the application (in this case the priority document), listing earlier foreign or US applications under the heading "foreign priority benefits under Title 35, United States Code, 119" or "benefit under Title 35, U.S.C., 120 of any United States application(s)".
Source: http://www.epo.org/law-practice/legal-texts/html/guidelinespct/e/f_vi_1_4.htm
Date retrieved: 17 May 2021