This book focuses on the participation of U.S. based women entrepreneurs in Patents and Trademarks activity. Using data obtained from the United States Patents and Trademarks Office, the book probes, in-depth, the number of patents and trademarks obtained by women entrepreneurs as well as the concomitant gender gap for the period 1975-2010. The purpose of this book is to quantitatively define the number of women entrepreneurs applying for and receiving patents and trademarks, and analyse the differences in the number of women applying for and receiving patents and trademarks as compared to men.