Patents Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 07/24/98

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,534,923        06/548,453        11/03/83        08/13/85       07/24/98
4,752,170        06/903,636        09/04/86        06/21/88       07/28/98
5,125,647        07/492,640        03/13/90        06/30/92       07/28/98
5,141,224        07/790,453        11/12/91        08/25/92       07/27/98
5,281,107        07/944,675        09/15/92        01/25/94       07/24/98