Analysis of information sources in references of the Wikipedia article "Courier (typeface)" in English language version.
Adrian Frutiger had nothing to do with the design, though IBM hired him in the late 1960s to design a version of his Univers typeface for the Selectric.
{{cite web}}: CS1 maint: archived copy as title (link)integrated into Mandriva Linux 2008
IBM neglected to trademark the typeface names like Courier and Prestige, so once the patents had lapsed, the names gradually fell into the public domain without IBM doing anything about it (at the time, and for a dozen years or so, IBM was distracted by a major U.S. anti-trust suit). Most students of the type protection field believe that those names are probably unprotectable by now, though IBM could still presumably make a try for it if sufficiently motivated.
{{cite web}}: CS1 maint: archived copy as title (link)integrated into Mandriva Linux 2008