Yoshiro Nakamatsu
Nakamatsu claims IBM reached licensing agreements with him in the late 1970s. He also claims to have licensed his floppy disk to IBM in 1979, but that the details are "confidential". An IBM spokesman, Mac Jeffery, confirmed that the company did license some of his patents, but claimed they were not for the floppy disk, which he claimed IBM invented on its own. Another IBM spokesman, Brian Doyle, said they licensed 14 patents from Nakamatsu, but also claimed that they do not have anything to do with the floppy disk.
History of the floppy disk
Things changed dramatically in 1982 when the Microfloppy Industry Committee (MIC), a consortium ultimately of 23 media companies, agreed upon a -inch media specification based upon but differing from the original Sony design. The first single-sided drives compatible with this new media specification shipped in early 1983, followed immediately in 1984 by double-sided compatible versions. In 1984, Apple Computer selected the format for their new Macintosh computers. Then, in 1985, Atari adopted it for their new ST line, and Commodore for their new Amiga. By 1988, the -inch was outselling the -inch. In South Africa, the -inch format was generally called a stiffy disk, to distinguish it from the flexible 5½-inch format.