Patents Reinstated Due to the Acceptance of aLate
                         Maintenance Fee From 4/20/01

Patent          Serial          Filing          Issue           Granted
Number          Number          Date            Date            Date

4,711,538       06/912,987      09/29/86        12/08/87        04/23/01
4,809,272       06/909,549      09/22/86        02/28/89        04/20/01
5,013,507       07/415,898      09/29/89        05/07/91        04/25/01
5,020,102       07/387,732      08/01/89        05/28/91        04/26/01
5,143,545       07/668,841      09/20/91        09/01/92        04/20/01
5,188,096       07/666,513      03/07/91        02/23/93        04/24/01
5,283,063       07/830,333      01/31/92        02/01/94        04/23/01
5,425,898       08/126,920      09/27/93        06/20/95        04/20/01
5,472,387       08/253,903      06/03/94        12/05/95        04/24/01
5,495,865       08/411,493      03/28/95        03/05/96        04/24/01
5,540,798       08/382,509      02/02/95        07/30/96        04/24/01
5,566,397       08/360,272      12/21/94        10/22/96        04/24/01
5,581,740       08/317,510      10/04/94        12/03/96        04/20/01
5,594,238       08/390,683      02/17/95        01/14/97        04/20/01
5,595,839       08/456,391      06/01/95        01/21/97        04/20/01
5,604,792       08/478,575      06/07/95        02/18/97        04/20/01
5,606,453       08/049,955      04/20/93        02/25/97        04/26/01