For a trademark registration to remain valid, an Affidavit of Use (“Section 8 Affidavit”) must be filed: (1) between the fifth and sixth year following registration, and (2) within the year before the end of every ten-year period after the date of registration. The registrant may file the affidavit within a grace period of six months after the end of the sixth or tenth year, with payment of an additional fee.