Canada has a long history of innovation, but some inventions have had an impact far beyond what their creators first imagined. In this fascinating account, Canadian intellectual property expert Robert E. Mitchell looks back at four important innovations he encountered during his career—from a breakthrough aircraft engine component and the first feller buncher to advances in hockey skates and FieldTurf. Along the way, he reveals the patents, disputes and unexpected decisions that helped shape their success.

After obtaining a B.A. from McGill, Joan Clark pursued a law degree in French at the Université de Montréal. As a woman, Joan Clark had to be a pioneer in the choices she...