Patents Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 04/21/00

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,658,431        06/634,076        07/25/84        04/14/87       04/21/00
4,673,766        06/856,595        04/25/86        06/16/87       04/24/00
4,694,565        06/856,304        04/28/86        09/22/87       04/27/00
4,706,198        06/707,859        03/04/85        11/10/87       04/27/00
4,707,251        06/746,866        06/20/85        11/17/87       04/25/00
4,709,098        07/010,902        02/04/87        11/24/87       04/24/00
4,901,606        07/208,722        06/20/88        02/20/90       04/27/00
4,948,086        07/436,074        11/13/89        08/14/90       04/24/00
4,957,019        07/339,821        12/22/88        09/18/90       04/27/00
4,982,166        07/317,678        03/01/89        01/01/91       04/24/00
4,987,813        07/462,597        01/09/90        01/29/91       04/24/00
4,995,410        07/462,644        01/09/90        02/26/91       04/27/00
5,014,462        07/458,968        12/29/89        05/14/91       04/25/00
5,059,909        07/328,254        02/27/89        10/22/91       04/27/00
5,064,725        07/645,810        01/25/91        11/12/91       04/27/00
5,086,232        07/547,467        06/29/90        02/04/92       04/27/00
5,337,539        07/935,155        08/25/92        08/16/94       04/27/00
5,341,890        08/002,295        01/08/93        08/30/94       04/24/00
5,370,343        08/026,373        03/04/93        12/06/94       04/27/00
5,381,631        08/048,659        04/15/93        01/17/95       04/26/00
5,398,984        08/020,707        02/22/93        03/21/95       04/27/00
5,405,368        07/964,210        10/20/92        04/11/95       04/24/00
5,416,173        08/275,454        07/15/94        05/16/95       04/25/00
5,419,677        08/053,430        04/28/93        05/30/95       04/26/00
5,437,221        08/256,730        10/12/94        08/01/95       04/25/00
5,450,899        08/108,699        12/16/93        09/19/95       04/27/00
5,454,015        08/283,727        08/01/94        09/26/95       04/25/00
5,460,649        08/254,221        06/06/94        10/24/95       04/25/00
5,471,443        08/301,040        09/06/94        11/28/95       04/27/00
5,476,771        08/021,033        02/22/93        12/19/95       04/24/00
5,482,015        08/274,395        07/11/94        01/09/96       04/25/00