Patents Reinstated Due to the Acceptance of a
                       Late Maintenance Fee From 8/31/01

Patent          Serial          Filing          Issue           Granted
Number          Number          Date            Date            Date

4,733,856       07/080,395      07/31/87        03/29/88        08/31/01
4,981,869       07/458,889      12/29/89        01/01/91        09/05/01
5,162,873       07/751,028      08/28/91        11/10/92        09/05/01
5,188,172       07/752,706      08/30/91        02/23/93        09/04/01
5,232,051       07/824,542      01/23/92        08/03/93        09/04/01
5,419,095       08/028,790      03/09/93        05/30/95        09/06/01
5,449,423       07/959,358      10/13/92        09/12/95        08/31/01
5,580,577       08/544,363      10/17/95        12/03/96        08/31/01
5,638,772       08/552,216      11/02/95        06/17/97        09/05/01