Patents Reinstated Due to the Acceptance of a
                       Late Maintenance Fee From 8/21/98

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,580,629        06/706,951        02/28/85        04/08/86       08/24/98
4,690,213        06/825,338        02/03/86        09/01/87       08/24/98
4,739,547        07/096,100        09/11/87        04/26/88       08/21/98
4,806,918        07/042,544        04/24/87        02/21/89       08/21/98
4,817,043        07/213,026        06/28/88        03/28/89       08/25/98
4,874,952        07/187,367        04/28/88        10/17/89       08/25/98
4,898,197        07/120,942        11/16/87        02/06/90       08/21/98
4,906,484        07/146,845        01/22/88        03/06/90       08/21/98
5,129,045        07/677,315        03/29/91        07/07/92       08/25/98
5,175,223        07/665,851        03/07/91        12/29/92       08/27/98
5,176,520        07/510,141        04/17/90        01/05/93       08/24/98
5,179,205        07/687,147        04/18/91        01/12/93       08/27/98