Amkor Technology to Enforce Patent Rights

CHANDLER, ARIZ., - Amkor Technology (Nasdaq - AMKR) has filed suit against ST Assembly Test Services, Inc. and ST Assembly Test Services Ltd. of Singapore (STATS). The suit, filed in Federal District court in the Eastern District of the State of Texas, alleges infringement of Amkor's United States Patent No. 6,143,981 ('981 Patent). Amkor alleges that by making, using, selling, offering for sale, or the importation into the U.S. of the STATS' Quad Leadless Package, the two defendants infringe on one or more of the 19 separate MicroLeadFrame(tm) packaging technology claims in the '981 Patent.

"Amkor has invested heavily in research and development for semiconductor packaging technology and has placed an emphasis on expanding its intellectual property portfolio in recent years." said John Boruch, President of Amkor Technology. "Amkor is acting to protect the interests of its employees, shareholders and the investment community by bringing the federal lawsuit against STATS." said Boruch. "We will protect our property."

Amkor is represented in the suit by the law firm of Jenkens & Gilchrist of Dallas, Texas.

About Amkor Technology: Amkor Technology, Inc. is the world's largest provider of contract microelectronics manufacturing solutions. The company offers semiconductor companies and electronics OEMs a complete set of microelectronic design and manufacturing services, including deep sub-micron wafer fabrication; wafer probe, wafer mapping, characterization and reliability testing; IC packaging design and assembly; multi-chip module design and assembly; and final testing. More information on Amkor is available from the company's SEC filings and on Amkor's web site: www.amkor.com.

Forward-Looking Statement: This news release may contain forward-looking statements that involve risk and uncertainty that could cause actual results to differ from anticipated results. Further information on risk factors that could affect the outcome of events set forth in these statements and that would affect the company's operating results and financial condition is detailed in the company's filings with the Securities and Exchange Commission, including the Report on Form 10-K for the fiscal year ended December 31, 1999.

For more information, contact:

Annie Ho
Always Communications
852-2855-7819
AnnieH@agrapha-group.com

Ken Jensen (Director - Communications)
Amkor Technology
1-(480) 821-2408 ext. 5130
kjens@amkor.com

Jeffrey Luth (VP Investor Relations)
Amkor Technology
1-(610) 431-9600 ext. 5613
jluth@amkor.com