http://en.wikipedia.org/wiki/AMD#8086.2C_80286.2C_80386.2C_Am486
"In February 1982, AMD signed a contract with Intel, becoming a licensed second-source manufacturer of 8086 and 8088 processors. "
and wiki is never wrong
"On December 30, 1994 the Supreme Court of California finally formally denied AMD rights to use the i386's microcode. Afterwards AMD and Intel concluded an agreement, the details of which remain largely secret, which gave AMD the right to produce and sell microprocessors containing the microcodes of Intel 286, 386, and 486. The agreement appears to allow for full cross-licensing of patents and some copyrights, allowing each partner to use the other's technological innovations without charge."
"In February 1982, AMD signed a contract with Intel, becoming a licensed second-source manufacturer of 8086 and 8088 processors. "
and wiki is never wrong
"On December 30, 1994 the Supreme Court of California finally formally denied AMD rights to use the i386's microcode. Afterwards AMD and Intel concluded an agreement, the details of which remain largely secret, which gave AMD the right to produce and sell microprocessors containing the microcodes of Intel 286, 386, and 486. The agreement appears to allow for full cross-licensing of patents and some copyrights, allowing each partner to use the other's technological innovations without charge."