Patents Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 02/18/00

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,673,456        06/777,032        09/17/85        06/16/87       02/18/00
4,984,143        07/407,392        09/14/89        01/08/91       02/23/00
5,026,726        07/448,432        12/11/89        06/25/91       02/22/00
5,800,402        07/523,153        05/14/90        01/14/92       02/23/00
5,244,167        07/747,515        08/20/91        09/14/93       02/18/00
5,257,609        07/710,091        06/04/91        11/02/93       02/18/00
5,316,748        07/990,052        12/14/92        05/31/94       02/22/00
5,456,089        08/036,395        03/24/93        10/10/95       02/23/00
5,456,395        08/030,918        03/15/93        10/10/95       02/23/00
5,456,720        08/126,166        09/23/93        10/10/95       02/23/00
5,468,425        08/283,625        08/01/94        11/21/95       02/22/00
5,469,805        08/178,755        01/07/94        11/28/95       02/23/00