Patents Reinstated Due to the Acceptance of a
                       Late Maintenance Fee From 2/21/97


Patent           Serial            Filing          Issue        Granted
Number           Number            Date            Date         Date

4,366,813        06/275,931        06/22/81        01/04/83     02/27/97
4,375,284        06/269,994        06/03/81        03/01/83     02/26/97
4,466,973        06/463,062        02/01/83        08/21/84     02/26/97
4,623,795        06/613,860        05/24/84        11/18/86     02/21/97
4,626,346        06/827,867        02/10/86        12/02/86     02/21/97
4,644,706        06/822,328        01/27/86        02/24/87     02/27/97
4,655,829        06/776,981        09/11/85        04/07/87     02/27/97
4,664,443        06/796,541        11/08/85        05/12/87     02/27/97
4,664,992        06/654,136        09/26/84        05/12/87     02/25/97
4,675,245        06/622,207        06/19/84        06/23/87     02/25/97
4,722,474        06/826,127        02/04/86        02/02/88     02/27/97
4,722,888        06/717,613        03/29/85        02/02/88     02/25/97
4,722,890        06/769,684        08/27/85        02/02/88     02/26/97
4,727,146        06/748,854        06/26/85        02/23/88     02/28/97
4,728,469        06/823,339        01/28/86        03/01/88     02/27/97
4,764,051        07/075,399        07/20/87        08/16/88     02/25/97
4,828,979        06/669,334        11/08/84        05/09/89     02/28/97
4,943,063        07/330,055        03/29/89        07/24/90     02/26/97
4,977,655        07/340,383        04/18/89        12/18/90     02/25/97
4,980,826        06/590,900        03/19/84        12/25/90     02/28/97
4,986,274        07/453,123        12/04/89        01/22/91     02/27/97
4,990,291        07/161,934        02/29/88        02/05/91     02/27/97
5,067,175        07/576,614        08/31/90        11/26/91     02/28/97


                 Patents Reinstated Due to the Acceptance of a
                       Late Maintenance Fee From 3/07/97

Patent           Serial            Filing          Issue        Granted
Number           Number            Date            Date         Date

4,764,513        06/907,261        09/15/86        08/16/88     03/11/97
4,769,005        07/083,500        08/06/87        09/06/88     03/13/97
4,810,693        07/049,646        05/11/87        03/07/89     03/07/97
4,983,258        07/251,761        10/03/88        01/08/91     03/10/97
5,084,785        07/522,673        05/11/90        01/28/92     03/11/97
5,108,624        07/491,979        03/12/90        04/28/92     03/13/97
5,115,919        07/739,309        08/01/91        05/26/92     03/07/97
5,168,989        07/688,975        04/22/91        12/08/92     03/11/97