Patents Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 04/07/00

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,411,206        06/284,813        07/20/81        10/25/83       04/13/00
4,573,327        06/652,849        09/21/84        03/04/86       04/11/00
4,616,263        06/700,424        02/11/85        10/07/86       04/10/00
4,958,310        07/122,946        11/19/87        09/18/90       04/10/00
5,053,983        06/849,071        04/04/86        10/01/91       04/13/00
5,248,391        07/942,858        09/10/92        09/28/93       04/10/00
5,392,424        07/897,183        06/11/92        02/21/95       04/13/00
5,458,179        08/298,216        08/29/94        10/17/95       04/12/00