Patents Reinstated Due to the Acceptance of a
                       Late Maintenance Fee From 6/06/97

Patent           Serial            Filing          Issue        Granted
Number           Number            Date            Date         Date

4,581,863        06/648,186        09/06/84        04/15/86     06/09/97
4,800,438        07/129,980        12/08/87        01/24/89     06/06/97
5,011,146        07/399,227        08/28/89        04/30/91     06/09/97
5,018,950        07/461,022        01/04/90        05/28/91     06/09/97
5,087,495        07/334,924        04/07/89        02/11/92     06/10/97
5,096,159        07/643,021        01/18/91        03/17/92     06/10/97