Lamarr and Anthiel received a patent in 1941, but the enormous significance of their invention was not realized until decades later. It was first implemented on naval ships during the Cuban Missile Crisis and subsequently emerged in numerous military applications.
Cash back credit card reward programs started out rather simply, offering a flat percentage rate (typically 1 percent of purchases) rebated back to the customer in the form of a check at the end of the year or a statement credit.
Earn Cash Back Rewards with One of Citi's Best Cash Back Credit Cards. Earn cash back on your purchases with one of Citi's best cash back credit cards. The Citi Double Cash card lets you earn cash back twice â 1% unlimited on purchases and an additional 1% as you pay for those purchases. Learn why this has become one of Citi's most exciting rewards credit cards.