Patent Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 11/12/99

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,534,843        06/462,038        01/28/83        08/13/85       11/18/99
4,651,899        06/706,850        02/12/85        03/24/87       11/18/99
4,652,487        06/760,445        07/30/85        03/24/87       11/18/99
5,030,493        07/362,948        06/08/89        07/09/91       11/18/99
5,228,215        07/491,275        03/09/90        07/20/93       11/15/99
5,366,980        08/114,845        09/02/93        11/22/94       11/16/99
5,405,487        08/115,433        09/01/93        04/11/95       11/15/99
5,435,016        08/280,115        07/25/94        07/25/95       11/18/99
5,440,056        08/208,509        03/09/94        08/08/95       11/15/99
5,449,605        08/044,618        04/06/93        09/12/95       11/16/99