Semiconductor whiz Gerald Yin left the U.S. and spent 18 years in China building what he said would be a worldwide powerhouse in chip-making equipment. Now the American citizen’s lifework has been thrown into uncertainty as U.S. restrictions undermine the global industry integration he celebrated.
Mr. Yin’s company, Advanced Micro-Fabrication Equipment Inc., or AMEC, had been making big strides and was gunning for industry leaders based in the U.S. and Japan when Washington stepped in.
