Patents Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 07/17/98

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,804,449        07/090,404        08/27/87        02/14/89       07/20/98
4,888,797        07/109,501        10/16/87        12/19/89       07/20/98
5,116,604        07/765,811        09/26/91        05/26/92       07/20/98
5,221,471        07/723,007        06/27/91        06/22/93       07/20/98