IBM sued Corona Data Systems, and Corona settled [1].

IBM sued Handwell Corporation, and Handwell settled [1].

IBM sued Eagle Computer Inc., and Eagle settled [2].

[1] https://books.google.com/books?id=gy4EAAAAMBAJ&lpg=PA15&pg=P... [2] https://www.nytimes.com/1984/02/22/business/eagle-ibm-settle...