Commercial warfare erupted last week between two technological titans. International Business Machines Corp. invaded the $1.5 billion-a-year office-copier market by bringing out a machine remarkably similar to a couple made by Xerox Corp., which has long dominated the field. The venture is IBM's most ambitious foray into a new market in the decade since Thomas Watson Jr. took over as chairman. Xerox countered with a lawsuit charging 22 patent infringements and asking a federal district court in Manhattan to prevent IBM from selling its new product.
Denying Xerox's accusations, Bart M. Stevens, president of IBM's office-products division, said that the...