Patents Reinstated Due to the Acceptance of a
                       Late Maintenance Fee From 4/27/01

Patent          Serial          Filing          Issue           Granted
Number          Number          Date            Date            Date

4,712,361       06/751,911      07/05/85        12/15/87        04/27/01
4,775,398       07/008,938      01/30/87        10/04/88        05/03/01
4,824,130       07/109,660      10/19/87        04/25/89        04/30/01
5,003,715       07/519,631      05/07/90        04/02/91        05/02/01
5,027,794       07/481,886      02/20/90        07/02/91        05/02/01
5,064,759       07/501,047      03/29/90        11/12/91        05/02/01
5,091,102       07/563,561      08/03/90        02/25/92        04/30/01
5,106,643       07/387,384      07/27/89        04/21/92        05/02/01
5,142,166       07/778,313      10/16/91        08/25/92        04/30/01
5,170,004       07/740,452      08/05/91        12/08/92        05/03/01
5,234,188       07/868,957      04/16/92        08/10/93        05/03/01
5,452,124       08/206,423      03/04/94        09/19/95        04/27/01
5,512,490       08/289,001      08/11/94        04/30/96        05/03/01
5,532,139       08/414,376      03/31/95        07/02/96        05/03/01
5,535,668       08/169,317      12/17/93        07/16/96        05/03/01
5,539,735       08/365,454      12/28/94        07/23/96        05/02/01
5,568,700       08/478,888      06/07/95        10/29/96        04/30/01
5,569,751       08/447,540      05/24/95        10/29/96        04/27/01
5,644,704       08/348,268      11/30/94        07/01/97        04/30/01