Among Moskowitz's 140 issued US patents is United States Patent 5,528,222, "Radio frequency circuit and memory in thin flexible package". This invention forms the basis for the design of today's RFID tags for the retail supply chain. These tags are manufactured today in the hundreds of millions. The United States patent states "The elements of the package (substrate, antenna, and laminated covers) are flexible. The elements of the package are all thin. The tag is thin and flexible, enabling a unique range of applications including: RFID tagging of credit cards, passports, admission tickets, and postage stamps." This patent has been cited as a reference by over one thousand US patents. It has been the subject of litigation between some of the major players in the RFID field, e.g. between Intermec and Symbol Technologies and between Intermec and Alien Technology.