Patents Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 01/30/98
   
Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,386,525        06/414,305        09/02/82        06/07/83       01/30/98
4,412,369        06/387,695        06/11/82        11/01/83       02/02/98
4,470,546        06/415,822        09/07/82        09/11/84       02/03/98
4,487,347        06/531,405        09/12/83        12/11/84       02/05/98
4,708,828        06/853,507        04/18/86        11/24/87       01/30/98
4,733,045        06/938,975        12/08/86        03/22/88       02/02/98
4,790,904        07/051,730        05/19/87        12/13/88       02/02/98
4,837,860        07/177,320        04/04/88        06/13/89       02/02/98
4,838,705        07/059,112        06/08/87        06/13/89       02/03/98
4,841,685        07/120,771        11/13/87        06/27/89       02/02/98
4,841,999        07/087,916        08/21/87        06/27/89       02/05/98
4,843,402        06/879,383        06/27/86        06/27/89       02/02/98
4,863,314        07/167,499        03/14/88        09/05/89       02/02/98
4,870,410        07/158,716        02/22/88        09/26/89       02/03/98
5,067,620        07/583,206        09/17/90        11/26/91       01/30/98
5,073,830        07/462,416        01/09/90        12/17/91       02/05/98
5,100,358        07/544,193        06/26/90        03/31/92       02/02/98
5,117,049        07/718,915        06/24/91        05/26/92       01/30/98
5,118,844        07/677,173        03/29/91        06/02/92       02/02/98
5,136,371        07/494,101        03/15/90        08/04/92       01/30/98
5,147,102        07/653,306        02/11/91        09/15/92       01/30/98
5,172,693        07/465,510        01/16/90        12/22/92       01/30/98
5,173,629        07/435,568        11/13/89        12/22/92       02/05/98
5,199,704        07/790,418        11/07/91        04/06/93       02/05/98
5,201,872        07/826,127        01/27/92        04/13/93       02/05/98
5,209,106        07/736,406        07/26/91        05/11/93       01/30/98
5,217,511        07/826,302        01/24/92        06/08/93       01/30/98
5,221,471        07/723,007        06/27/91        06/22/93       02/02/98
5,223,260        07/297,402        01/17/89        06/29/93       01/30/98
5,237,782        07/694,122        05/01/91        08/24/93       02/02/98
5,242,336        07/910,406        07/08/92        09/07/93       01/30/98
5,242,391        07/787,306        10/30/91        09/07/93       01/30/98
5,243,929        07/764,837        09/24/91        09/14/93       02/02/98
5,291,914        08/086,046        06/30/93        03/08/94       01/30/98