Phillips Petroleum Company, founded in 1917, is a fully integrated petroleum company. Phillips is engaged in exploration and production on a worldwide scale; gathering, processing and marketing natural gas in North America through equity interest in Duke Energy Field Services; refining, marketing and transporting petroleum and petroleum products in the United States; producing and distributing chemicals and plastics worldwide through equity interest in Chevron Phillips Chemical Company; and developing technology for its own use, as well as for licensing worldwide. In September 2001, the Company acquired Tosco Corp., an independent refiner. The combined company will sell gasoline under several well-known brands, including Phillips 66, '76 and Circle K.