On August 30, 2013, the US Patent & Trademark Office published Apple's latest registered trademark for "Passbook" under registration number 4,391,155. The trademark which was officially granted on Monday was originally filed for in November 2012. The Passbook icon was granted registered status on August 01, 2013. Passbook is an application in iOS that allows users to store coupons, boarding passes, event tickets, store cards, 'generic' cards and other forms of mobile payment. Passbook debuted during Apple's World Wide Developer Conference on June 11, 2012 and released on September 19, 2012.