Patterns in Patent Filings (image) Princeton University, Engineering School Caption The researchers identified groups of patents related to an initial patent for "porous products." The size of a dot in the illustration reflects the impact of the patent on multiple product groups. Credit Illustration by Prem Gopalan, Princeton Department of Computer Science. Usage Restrictions non commercial use Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.