Continued use declaration - section 71
The holder of international registration who has extended registration to the United States must file declaration of continued use/ excusable non-use of the mark in inter-state commerce between 5-6 years and 9-10 years after registration. Inter-state commerce can be between USA and another nation (example: Canada, United Kingdom, Spain etc) OR between different states of the United States. Below form is flexible and covers additional options including order for section 15 incontestability. The benefits of section 15 incontestability filing is well noted in trademark FAQs page.