Apparatus and methods for detecting overlay errors using scatterometry Grant US-10451412-B2 United States of America 22 Oct 2019
Periodic patterns and technique to control misalignment between two layers Grant US-10151584-B2 United States of America 11 Dec 2018
Periodic patterns and technique to control misalignment between two layers Grant US-9835447-B2 United States of America 05 Dec 2017