Patents Reinstated Due to the Acceptance of a
                       Late Maintenance Fee From 9/11/98

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

Re. 34,501       07/707,742        05/30/91        01/11/94       09/11/98
4,460,694        06/356,348        03/09/82        07/17/84       09/14/98
4,557,009        06/653,689        09/21/84        12/10/85       09/14/98
4,800,233        07/081,267        08/03/87        01/24/89       09/16/98
4,815,545        06/849,707        04/09/86        03/28/89       09/16/98
4,897,139        07/219,786        07/18/88        01/30/90       09/16/98
4,897,868        07/224,118        07/25/88        01/30/90       09/16/98
4,910,660        07/121,095        11/16/87        03/20/90       09/16/98
4,964,554        07/397,773        08/23/89        10/23/90       09/14/98
5,117,561        07/636,688        01/02/91        06/02/92       09/14/98
5,118,052        07/115,333        11/02/87        06/02/92       09/16/98
5,129,033        07/496,256        03/20/90        07/07/92       09/15/98
5,177,226        07/712,098        06/07/91        01/05/93       09/17/98
5,257,575        07/821,757        01/15/92        11/02/93       09/16/98
5,267,420        07/862,420        04/02/92        12/07/93       09/16/98
5,274,688        07/863,807        04/07/92        12/28/93       09/16/98
5,296,350        07/606,463        10/31/90        03/22/94       09/14/98