The Story of No. 7419,603
It can take an inventor years to receive an official U.S. patent, usually represented by a seven-digit number. But the full story behind most patents is much longer. Drexel Engineering Professor Young Cho spent nearly two decades experimenting with ways to improve on large industrial cooling systems before finalizing a patent in 2007. Now, his wastewater treatment concept is commercially available through a King of Prussia spin-off run by his son and Drexel alumni, and this is the story of how it came to be.