Exhibit 10.4 REGISTRATION RIGHTS AGREEMENT This Registration Rights Agreement is made and entered into as of December 7, 2001 (this "AGREEMENT"), by and between IGEN International, Inc., a Delaware corporation (the "COMPANY"), and Acqua Wellington...Registration Rights Agreement • December 19th, 2001 • Igen International Inc /De • Patent owners & lessors • New York
Exhibit 10.1 PURCHASE AGREEMENT ------------------ This PURCHASE AGREEMENT (this "AGREEMENT"), dated as of December 7, 2001, is entered into by and between IGEN INTERNATIONAL, INC., a Delaware corporation (the "COMPANY"), and ACQUA WELLINGTON PRIVATE...Purchase Agreement • December 19th, 2001 • Igen International Inc /De • Patent owners & lessors • New York
