Patents Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 02/11/00

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

Re. 33,774       07/554,457        07/19/90        12/24/91       02/15/00
4,616,039        06/727,989        04/29/85        10/07/86       02/16/00
4,663,665        06/814,493        12/30/85        05/05/87       02/16/00
4,684,119        06/625,795        06/28/84        08/04/87       02/15/00
4,887,494        07/978,852        09/17/87        12/19/89       02/14/00
4,904,112        07/385,565        07/26/89        02/27/89       02/14/00
4,920,270        07/094,192        09/08/87        04/24/90       02/17/00
4,932,197        07/291,277        12/28/88        06/12/90       02/07/00
5,245,960        07/918,444        07/22/92        09/21/93       02/15/00
5,330,246        07/978,110        11/18/92        07/19/94       02/16/00
5,336,188        08/069,937        05/28/93        08/09/94       02/14/00
5,367,309        08/044,014        07/09/93        11/22/94       02/14/00
5,380,273        08/065,470        05/19/93        01/10/95       02/17/00
5,393,301        07/934,521        10/05/92        02/28/95       02/15/00
5,397,565        08/239,292        05/06/94        03/14/95       02/17/00
5,404,594        08/425,538        04/05/93        04/11/95       02/16/00
5,425,925        08/214,597        03/18/94        06/20/95       02/17/00
5,430,434        08/022,004        02/24/93        07/04/95       02/15/00
5,434,418        07/962,129        10/16/92        07/18/95       02/11/00