The 250 nm process (250 nanometer process or 0.25 μm process) is a level of semiconductor process technology that was reached by most manufacturers in the 1997 - 1998 timeframe.
Products featuring 250 nm manufacturing process
The DECAlpha 21264A, which was made commercially available in 1999.
The AMD K6-2Chomper and Chomper Extended. Chomper was released on May 28, 1998.