Patents Reinstated Due to the Acceptance of a
                       Late Maintenance Fee From 7/11/97

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,472,358        06/382,615        05/27/82        09/18/84       07/16/97
5,003,039        07/273,443        11/18/88        03/26/91       07/14/97
5,015,087        07/516,515        04/30/90        05/14/91       07/16/97
5,020,083        07/354,408        05/19/89        05/28/91       07/16/97
5,098,426        07/307,315        02/06/89        03/24/92       07/16/97
5,115,919        07/739,309        08/01/91        05/26/92       07/16/97
5,167,066        07/744,113        08/08/91        12/01/92       07/16/97
5,172,679        07/749,312        08/23/91        12/22/92       07/16/97

                 Patents Reinstated Due to the Acceptance of a
                       Late Maintenance Fee From 7/18/97

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,502,653        06/452,037        12/22/82        03/05/85       07/22/97
4,535,259        06/389,819        06/18/82        08/13/85       07/21/97
4,538,245        06/367,331        04/12/82        08/27/85       07/21/97
4,644,706        06/822,328        01/27/86        02/24/87       07/24/97
4,662,899        06/720,100        04/05/85        05/05/87       07/18/97
4,783,818        06/788,411        10/17/85        11/08/88       07/24/97
4,806,495        07/211,101        06/15/88        02/21/89       07/21/97
4,816,080        06/913,794        09/29/86        03/28/89       07/21/97
4,980,572        07/124,172        01/25/88        12/25/90       07/24/97
4,993,239        07/526,240        05/18/90        02/19/91       07/21/97
5,103,946        07/609,626        11/06/90        04/14/92       07/18/97
5,105,998        07/585,059        12/18/90        04/21/92       07/22/97
5,124,130        07/526,822        05/22/90        06/23/92       07/21/97
5,148,500        07/645,194        01/24/91        09/15/92       07/21/97
5,162,469        07/740,591        08/05/91        11/10/92       07/21/97
5,189,671        07/812,171        12/20/91        02/23/93       07/21/97
5,197,940        07/471,498        01/29/90        03/30/93       07/24/97
5,211,667        07/872,131        04/22/92        05/18/93       07/18/97