Unocal board won't back CNOOC bid Unocal Corp.'s directors refused to support a takeover of their company by CNOOC Ltd., the oil company whose parent is owned by the government of China. Sources familiar with the bid said the Unocal directors didn't back the unsolicited takeover bid because the CNOOC bid did not raise the Chinese oil company's $18.5 billion cash offer. San Ramon-based Chevron Corp. (CVX) has offered $16.3 billion in cash and stock to snap up Unocal. Chevron says its bid is superior to CNOOC's because the Chevron bid would close quickly, while CNOOC's proposal faces lengthy government...