Patents Reinstated Due to the Acceptance of a
                       Late Maintenance Fee From 2/23/01

Patent          Serial          Filing          Issue           Granted
Number          Number          Date            Date            Date

Re. 33,523      07/434,418      11/13/89        01/22/91        02/27/01
4,758,533       07/099,792      09/22/87        07/19/88        03/01/01
4,784,399       07/029,449      03/23/87        11/15/88        02/27/01
4,820,259       07/055,950      06/01/87        04/11/89        02/27/01
4,987,882       07/475,223      02/05/90        01/29/91        02/27/01
5,008,678       07/487,338      03/02/90        04/16/91        03/01/01
5,024,203       07/571,322      08/22/90        06/18/91        02/23/01
5,036,569       07/474,542      02/02/90        08/06/91        02/27/01
5,108,964       07/310,381      02/15/89        04/28/92        02/28/01
5,109,127       07/608,738      11/05/90        04/28/92        03/01/01
5,121,922       07/715,688      06/14/91        06/16/92        02/26/01
5,153,057       07/690,347      04/24/91        10/06/92        02/23/01
5,159,759       07/721,170      06/26/91        11/03/92        02/27/01
5,176,899       07/797,776      11/25/91        01/05/93        02/27/01
5,385,398       07/937,890      09/30/92        01/31/95        02/27/01
5,447,321       08/273,084      07/08/94        09/05/95        02/23/01
5,450,917       08/287,551      08/08/94        09/19/95        02/27/01
5,479,654       08/039,702      03/30/93        12/26/95        02/28/01
5,491,756       08/143,981      11/04/93        02/13/96        03/01/01
5,520,698       08/325,907      10/19/94        05/28/96        02/28/01
5,539,627       08/553,046      11/03/95        07/23/96        02/27/01
5,572,871       08/283,091      07/29/94        11/12/96        03/01/01
5,589,799       08/447,349      05/23/95        12/31/96        02/27/01
5,590,262       08/146,964      11/02/93        12/31/96        03/01/01
5,627,658       08/355,769      12/14/94        05/06/97        02/23/01