The Re-Inventors is a Canadian TV show based around exploring historic inventions and testing them. The show follows the hosts, Matt Hunter and Jeremy MacPherson, as they discover and reconstruct inventions to see how ideas from the past hold up in the present world. In each episode, the hosts choose a historic invention and attempt to rebuild it. The hosts would examine the original patent information, including blueprints, then, along with additional tradesmen as needed, build the prototypes, and test each of these, often strange, inventions to see if any could actually succeed. Often, a few related inventions would be tested in the same episode. Each invention was given a set of evaluation criteria before being tested. At the end of the episode, the invention was graded and if the invention was considered to have met the evaluation criteria, it was granted the title of 'Patent Approved'. If the invention proved to be less than effective, it was granted the title 'Patent Denied'.