Patent Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 09/10/99

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,585,069        06/662,447        10/18/84        04/29/86       09/10/99
4,637,597        06/628,244        07/06/84        01/20/87       09/14/99
4,685,246        06/794,656        12/20/85        08/11/87       09/10/99
4,841,183        06/923,480        10/27/86        06/20/89       09/14/99
4,971,934        07/397,587        08/23/89        11/20/90       09/10/99
4,981,095        07/470,974        01/26/90        01/01/91       09/10/99
5,239,794        07/875,875        04/29/92        08/31/93       09/14/99
5,407,246        08/130,206        10/01/93        04/18/95       09/13/99
5,426,894        08/160,975        12/03/93        06/27/95       09/10/99
5,440,053        08/240,112        05/09/94        08/08/95       09/13/99