Patents Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 01/21/00

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,527,574        06/478,795        03/25/83        07/09/85       01/24/00
4,578,955        06/678,277        12/05/84        04/01/86       01/24/00
4,629,625        06/645,446        08/29/84        12/16/86       01/24/00
4,630,524        06/639,701        08/13/84        12/23/86       01/24/00
4,638,647        06/813,319        12/24/85        01/27/87       01/24/00
4,708,710        06/844,959        03/27/86        11/24/87       01/24/00
5,008,990        07/501,015        03/29/90        04/23/91       01/21/00