Making carbon fiber from asphaltenes obtained through heavy oil upgrading. In more detail, carbon fiber is made from asphaltenes obtained from heavy oil feedstocks undergoing upgrading in a continuous coking reactor.
 The present invention was developed with support from the U.S. government under a contract with the United States Department of Energy, Contract No. DE-NA0000622. Accordingly, the U.S. government has certain rights in the present invention.