Filed application for patent filed in the United States may claim the benefit of, or priority to, a prior application filed in the United States. An applicant who claims the priority of one or more earlier national, regional or international applications for the same invention must indicate on the RequestWhoever was first to sell goods or services under a particular mark will typically be deemed the rightful trademark owner. This is known as trademark priority. An applicant must file a claim of priority within six months afterthe filing date of the foreign application. A priority claim is made to an earlierfiled patent application. For example, an Applicant can claim priority in a later-filed patent application. Constructive use priority is based on Section 7(c) of the Trademark Act. It is applicable once a trademark application is filed on the principal register. A priority claim must be filed within six months of the priority date of the foreign application.