Esther Sans Takeuchi (born Esther Sans, Latvian: Estere Sāns) is a materials scientist and chemical engineer, working on energy storage systems and power sources for biomedical devices. She is also a Distinguished Professor at Stony Brook University and a chief scientist at Brookhaven National Laboratory. She holds more than 150 U.S. patents. “The battery was invented once and reinvented over 100 times. I don’t own the patent. The company does. It was called Greatbatch. Now it’s called Integer Corp. When you join a company, you sign over your patent rights to the company.”