Patents Reinstated Due to the Acceptance of a
                       Late Maintenance Fee From 3/23/01

Patent          Serial          Filing          Issue           Granted
Number          Number          Date            Date            Date

5,028,831       07/504,506      04/04/90        07/02/91        03/27/01
5,140,127       07/737,467      07/30/91        08/18/92        03/28/01
5,145,307       07/634,569      12/27/90        09/08/92        03/23/01
5,156,971       07/821,525      01/15/92        10/20/92        03/27/01
5,162,689       07/694,516      05/01/91        11/10/92        03/27/01
5,164,429       07/370,375      06/22/89        11/17/92        03/27/01
5,379,822       08/073,569      06/09/93        01/10/95        03/23/01
5,392,826       08/037,024      03/25/93        02/28/95        03/26/01
5,417,017       08/040,305      03/30/93        05/23/95        03/28/01
5,417,435       08/248,677      05/25/94        05/23/95        03/23/01
5,419,420       08/210,817      03/18/94        05/30/95        03/27/01
5,426,341       08/139,025      10/21/93        06/20/95        03/29/01
5,549,690       08/202,910      02/28/94        08/27/96        03/29/01
5,578,871       08/324,717      10/18/94        11/26/96        03/26/01
5,589,089       08/323,521      10/14/94        12/31/96        03/27/01