Summary:

- This article highlights 10 inventors who passed away before their inventions became successful and widely used. These inventors had innovative ideas that were ahead of their time, but they did not live to see their creations reach their full potential.

- The article covers a range of inventions, from the telephone and the electric car to the helicopter and the modern computer. It showcases the perseverance and vision of these inventors, who faced challenges and setbacks but remained dedicated to their ideas.

- The stories of these inventors serve as a reminder that progress often takes time and that the true impact of an invention may not be realized until long after the inventor's lifetime. The article celebrates the contributions of these unsung heroes of science and technology.