This book is the first detailed historical account of intellectual property law. In part, it examines why intellectual property law with its subcategories of patents, copyright, designs and trade marks took the shape that it did over the course of the nineteenth century. In addition the authors deal with ways in which the law grants property status to intangibles and describe how the law came to create techniques that enabled it to recognize protectable intangibles, and the inescapable problems that have arisen from their use.