![](https://sp-ao.shortpixel.ai/client/to_avif,q_glossy,ret_img,w_300,h_300/https://www.inventiv.org/wp-content/uploads/2020/08/brain-head-mind-question-thinking-icon-mind-thinking-png-512_512-1-300x300.png)
This can be the date on which the:
- patent application was filed;
- inventor can prove he/she thought of the invention and makes diligent efforts to file a patent application, build or test it; or
- invention was reduced to practice, meaning the inventor built a model and tested it in the United States, a North American Free Trade Agreement (NAFTA) or World Trade Organization (WTO) member country.