What is an Incontestable Trademark Registration?  A registered trademark is eligible to receive incontestable status after the first 5 years of its registration under Section 15 of the Lanham Act (15 U.S.C. Sect. 1065). • Incontestable trademark status denies others from challenging your trademark. A Combined Section 8 and 15 Declaration is required for applying for incontestable [...]