Patents Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 06/12/98
   
Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,821,809        06/632,279        07/20/84        04/18/89       06/12/98
4,834,523        07/027,009        03/17/87        05/30/89       06/12/98
4,866,627        07/062,663        06/16/87        09/12/89       06/12/98
4,871,337        07/078,415        07/27/87        10/03/89       06/12/98
4,896,689        07/270,315        11/14/88        01/30/90       06/12/98
5,109,103        07/667,214        01/22/91        04/28/92       06/17/98
5,188,314        07/681,931        04/08/91        02/23/93       06/12/98
5,227,791        07/804,582        12/10/91        07/13/93       06/16/98
5,252,822        07/951,907        09/28/92        10/12/93       06/17/98
5,259,381        07/377,722        07/10/89        11/09/93       06/17/98
5,271,141        07/819,112        01/10/92        12/21/93       06/12/98
5,286,860        07/975,409        11/12/92        02/15/94       06/12/98