Patents Reinstated Due to the Acceptance of a
                       Late Maintenance Fee From 4/13/01

Patent          Serial          Filing          Issue           Granted
Number          Number          Date            Date            Date

4,747,296       06/781,240      09/27/85        05/31/88        04/17/01
5,026,063       07/564,286      08/08/90        06/25/91        04/17/01
5,088,739       07/577,537      09/05/90        02/18/92        04/13/01
5,103,573       07/705,946      05/28/91        04/14/92        04/13/01
5,171,705       07/795,994      11/22/91        12/15/92        04/16/01
5,359,647       08/069,294      05/28/93        10/25/94        04/18/01
5,400,799       08/180,033      01/11/94        03/28/95        04/18/01
5,464,412       08/273,863      07/12/94        11/07/95        04/13/01
5,531,904       08/406,502      03/20/95        07/02/96        04/19/01
5,537,464       08/146,887      11/02/93        07/16/96        04/18/01
5,578,991       08/348,387      12/02/94        11/26/96        04/17/01
5,581,700       08/514,044      08/11/95        12/03/96        04/18/01
5,590,023       08/507,619      07/26/95        12/31/96        04/19/01
5,590,338       08/512,867      08/08/95        12/31/96        04/19/01
5,594,873       08/353,047      12/08/94        01/14/97        04/17/01
5,599,920       08/518,474      08/21/95        02/04/97        04/19/01
5,600,027       08/529,071      09/15/95        02/04/97        04/19/01