A famous example often cited by legal scholars, was a case involving the Getty Oil and Pennzoil in very early 1984. The parties had signed a "Memorandum of Agreement" _ viewed by the parties at the time as a Letter of Intent _ for a complex investment and stock transaction, whereby Pennzoil would purchase Getty Oil stock, and set forth general terms of the investment that had been reached in conversations, and also stipulated that the Memorandum was subject to the approval of the Board of Getty Oil. The Board of Getty Oil sooner approved the transaction and both parties announced on January 4, 1984 in a press release, an "agreement in principle" to the terms of the Memorandum. The final agreements for the merging of Texaco and Getty Oil were signed by the parties on January 6 _ 8.
Buyer accepts offer and signs it, where offer acceptance is binding depends of the legal jurisdiction. For example English and common law differs slightly from American uniform commercial law on matters of offer acceptance and when performance becomes binding on an offer. The seller can also reply with a pro forma invoice. In fact a pro forma invoice can serve as quote and offer, becoming a more or less binding purchase order upon buyer acceptance and signing. Pro formas are used more in smaller FCL trades, and not in larger bulk trades.