Patents Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 03/13/98
   
Patent           Serial            Filing          Issue          Granted 
Number           Number            Date            Date           Date

4,625,344        06/756,287        07/18/85        12/02/86       03/17/98
4,720,386        06/307,191        09/30/81        01/19/88       03/16/98
4,848,141        07/178,397        04/06/88        07/18/89       03/17/98
4,850,313        07/155,823        02/16/88        07/25/89       03/16/98
4,880,437        07/171,089        03/21/88        11/14/89       03/16/98
5,234,919        07/739,399        08/02/91        08/10/93       03/18/98