EXHIBIT 10 AMENDMENT TO RIGHTS AGREEMENT AMENDMENT TO RIGHTS AGREEMENT, dated as of March 27, 2002, (this "Amendment"), to the Rights Agreement, dated as of January 5, 2000 (the "Rights Agreement"), by and between Unocal Corporation (the "Company")...Rights Agreement • March 28th, 2002 • Unocal Corp • Crude petroleum & natural gas • New York
