Patented inventions are present in every aspect of human life. Electric lighting glows in our rooms due to patents held by Thomas Edison and Joseph Swan; plastic is omnipresent thanks to patents registered by Leo Baekeland; and even ballpoint pens would not be on every desk if Laszlo Biro hadn’t patented them. Elizabeth Doerr takes a look at patents in the watch industry, including the most famous of all: Abraham-Louis Breguet’s patent for the tourbillon.