Patents Reinstated Due to the Acceptance of a
                       Late Maintenance Fee From 5/18/01

Patent          Serial          Filing          Issue           Granted
Number          Number          Date            Date            Date

4,711,517       06/791,437      10/25/85        12/08/87        05/18/01
4,768,393       07/032,404      03/30/87        09/06/88        05/22/01
4,814,736       07/151,126      02/01/88        03/21/89        05/22/01
5,061,122       07/578,761      09/06/90        10/29/91        05/23/01
5,061,314       07/419,156      10/10/89        10/29/91        05/21/01
5,086,477       07/564,175      08/07/90        02/04/92        05/24/01
5,092,912       07/619,344      11/29/90        03/03/92        05/24/01
5,129,033       07/496,256      03/20/90        07/07/92        05/24/01
5,140,611       07/416,077      09/29/89        08/18/92        05/24/01
5,149,104       07/651,314      02/06/91        09/22/92        05/24/01
5,157,518       07/465,756      01/16/90        10/20/92        05/24/01
5,157,904       07/694,922      05/02/91        10/27/92        05/18/01
5,189,606       07/702,345      05/14/91        02/23/93        05/24/01
5,303,524       07/848,666      03/09/92        04/19/94        05/21/01
5,413,161       08/118,517      09/09/93        05/09/95        05/18/01
5,518,487       08/298,460      08/30/94        05/21/96        05/21/01
5,531,177       08/415,563      04/03/95        07/02/96        05/23/01
5,559,268       08/340,781      11/17/94        09/24/96        05/23/01
5,574,475       08/138,366      10/18/93        11/12/96        05/24/01
5,588,702       08/519,766      08/28/95        12/31/96        05/23/01
5,592,394       08/522,038      08/31/95        01/07/97        05/18/01
5,608,496       08/332,032      11/01/94        03/04/97        05/21/01
5,612,510       08/320,721      10/11/94        03/18/97        05/23/01