X0201 42003-10-31 0000888693 ISCO INTERNATIONAL INC ISO 0001169746 CALHOUN GEORGE M 451 KINGSTON COURT MT. PROSPECT IL 60056 1000Stock Option (right to buy).242003-10-314A050000A2003-10-312013-03-28Common Stock5000050000DStock Option (right to buy.382003-10-314D050000D2003-06-112013-03-28Common Stock500000DThe reporting person agreed to cancellation of an option granted to hin on March 28, 2003, in exchange for a new option having a lower exercise price.George M. Calhoun2003-11-04