United Microelectronics Corp of Taiwan finally launched its 80486-compatible microprocessor late Tuesday, declaring that it was fully confident it did not infringe any Intel Corp patents or other related intellectual property. We haven’t seen the part yet, said Intel darkly, But if they do we will take action. The parts are offered in 40MHz, 33MHz and 25MHz versions, and are priced comparably with Intel versions of the same clock speed, but are claimed to offer 30% higher performance and require less power. The company expects to do $30m business with the chips this year and $75m next. It claims development cost $19m and was doen with Meridian Semiconductor Inc, in which United Microelectronics holds 40%.