Patterns in Patent Filings (image) Princeton University, Engineering School Share Print E-Mail 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 Share Print E-Mail 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.