Patent Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 12/03/99

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,562,328        06/648,684        09/10/84        12/31/85       12/07/99
4,676,867        06/871,655        06/06/86        06/30/87       12/07/99
4,914,590        07/195,237        05/18/88        04/03/90       12/09/99
4,940,239        07/272,111        11/16/88        07/10/90       12/09/99
4,947,093        07/276,299        11/25/88        08/07/90       12/09/99
5,232,379        07/843,619        02/28/92        08/03/93       12/06/99
5,420,242        08/087,471        07/02/93        05/30/95       12/06/99
5,432,376        07/869,760        04/16/92        07/11/95       12/09/99