Patents Reinstated Due to the Acceptance of a
                       Late Maintenance Fee From 8/28/98

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,463,478        06/391,129        06/23/82        08/07/84       09/01/98
4,487,267        06/461,259        01/26/83        12/11/84       09/02/98
4,556,032        06/568,393        01/05/84        12/03/85       09/02/98
4,558,922        06/608,474        05/09/84        12/17/85       09/02/98
4,567,708        06/536,401        09/27/83        02/04/86       09/02/98
4,581,158        06/654,140        09/26/84        04/08/86       09/03/98
4,791,426        06/715,644        03/21/85        12/13/88       09/01/98
4,833,897        06/369,239        04/16/82        05/30/89       09/02/98
4,899,899        07/370,233        06/21/89        02/13/90       09/01/98
4,909,448        07/269,536        12/27/88        03/20/90       08/31/98
4,978,821        07/442,204        12/01/89        12/18/90       09/03/98
5,144,416        07/594,945        10/10/90        09/01/92       09/01/98
5,207,394        07/893,941        06/04/92        05/04/93       09/02/98
5,284,395        07/942,901        09/10/92        02/08/94       09/02/98
5,286,852        07/772,604        10/08/91        02/15/94       09/02/98