Patents Reinstated Due to the Acceptance of a
                       Late Maintenance Fee From 8/22/97

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,396,172        06/275,341        06/19/81        08/02/83       08/28/97
4,448,357        06/355,794        03/08/82        05/15/84       08/26/97
4,511,666        06/450,337        12/16/82        04/16/85       08/22/97
4,563,981        06/670,054        11/09/84        01/14/86       08/22/97
4,742,936        07/071,605        07/09/87        05/10/88       08/26/97
4,791,413        07/078,126        07/15/87        12/13/88       08/22/97
4,817,531        07/145,077        01/19/88        04/04/89       08/22/97
4,832,143        07/149,417        01/29/88        05/23/89       08/26/97
4,834,270        07/179,854        04/11/88        05/30/89       08/25/97
4,901,387        07/170,819        03/21/88        02/20/90       08/25/97
4,997,224        07/399,070        08/24/89        03/05/91       08/28/97
5,006,046        07/410,841        09/22/89        04/09/91       08/28/97
5,018,230        07/508,165        04/12/90        05/28/91       08/25/97
5,037,136        07/506,021        04/09/90        08/06/91       08/27/97
5,090,749        07/638,367        01/04/91        02/25/92       08/28/97
5,136,795        07/815,415        12/31/91        08/11/92       08/26/97
5,149,026        07/751,137        08/28/91        09/22/92       08/25/97
5,156,712        07/482,908        02/22/90        10/20/92       08/25/97
5,170,620        07/693,141        04/29/91        12/15/92       08/22/97
5,201,967        07/806,077        12/11/91        04/13/93       08/22/97
5,218,757        07/722,545        06/25/91        06/15/93       08/22/97
5,225,391        07/840,083        02/24/92        07/06/93       08/22/97

                 Patents Reinstated Due to the Acceptance of a
                       Late Maintenance Fee From 8/29/97

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,499,193        06/450,336        12/16/82        02/12/85       08/29/97
5,015,909        07/458,849        12/29/89        05/14/91       08/29/97
5,160,600        07/488,256        03/05/90        11/03/92       09/04/97

                 Patents Reinstated Due to the Acceptance of a
                       Late Maintenance Fee From 9/05/97

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,832,453        06/944,501        12/17/86        05/23/89       09/10/97