Willem Einthoven's patent

Have you seen today’s @GoogleDoodles? It’s in honour of Willem Einthoven who improved ECGs and received the Nobel Prize in medicine for it. Today would have been his 159th birthday. The fun bit for me is that Willem also filed a patent - given that a improvements to an ECG made it much better at detecting faint signals and did so responsively, he thought it might improve wireless radios. It didn’t. Not all inventions are created equal…