The tiny magnetic rings behind the dispute
Magnetic-core memory stored bits in small rings of magnetic material. A ring could be magnetized in one direction or the other to represent a 0 or a 1; electrical wires threaded through the rings let a computer select and change their states. The challenge was not simply making a ring remember. A computer needed a reliable way to send the right pulses through a dense array without accidentally changing neighboring bits.
Wang’s pulse-transfer device addressed that control problem. It helped make core memory practical as a working computer technology, where dependable reading and writing mattered as much as the magnetic material itself. Once a design became useful across machines, the question of who owned the rights to it carried real commercial weight.
A patent became a business asset
IBM and Wang became entangled in a lengthy legal and financial fight over the patent. Patent disputes in a fast-developing industry could determine who had to pay for permission to use a technology—and who could bargain from a position of strength. The conflict was therefore about more than a clever circuit: it concerned the value of a method that helped computers store information reliably.
Wang eventually sold the patent for $500,000. Rather than letting the deal end his role in computing, he put the proceeds toward building Wang Laboratories. The company later competed with IBM, turning the patent’s payout into the starting capital for a business that would challenge the much larger firm. The same invention that gave Wang leverage in a legal battle also helped finance his move from inventor to competitor.
