PURCHASE AGREEMENT PURCHASE AGREEMENT (this "Agreement"), dated as of December 16, 1997, by and among IGEN International, Inc., a Delaware corporation (the "Company"), and the entities whose names appear on the signature pages hereof. Such entities...Purchase Agreement • January 30th, 1998 • Igen International Inc /De • Patent owners & lessors • New York
Contract Type FiledJanuary 30th, 1998 Company Industry Jurisdiction
Exhibit 4.3 REGISTRATION RIGHTS AGREEMENT REGISTRATION RIGHTS AGREEMENT (this "Agreement"), dated as of December 16, 1997, by and among IGEN International, Inc., a Delaware corporation (the "Company"), and each of the entities whose names appear on...Registration Rights Agreement • January 30th, 1998 • Igen International Inc /De • Patent owners & lessors • New York
Contract Type FiledJanuary 30th, 1998 Company Industry Jurisdiction