Xerox Corporation was a multinational corporation serving the global document processing and financial services markets. In 1959, Xerox introduced the revolutionary plain paper copier, which drove explosive growth in the copying business. However, as competitors entered the market after Xerox's patent expired in 1970, its market share fell significantly. Under new leadership in the 1980s, Xerox developed a corporate revitalization plan called "Leadership Through Quality" to address its competitive problems.