Patents Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 01/07/00

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,606,623        06/316,665        10/30/81        08/19/86       01/11/00
4,683,964        06/791,217        10/25/85        08/04/87       01/10/00
4,820,957        07/126,308        11/27/87        04/11/89       01/10/00
4,875,154        07/061,338        06/12/87        10/17/89       01/13/00
4,937,966        07/444,281        12/01/89        07/03/90       01/12/00
5,008,959        07/486,374        02/28/90        04/23/91       01/12/00
5,010,010        07/393,851        08/14/89        04/23/91       01/11/00
5,265,584        07/764,893        09/24/91        11/30/93       01/11/00
5,283,611        07/786,488        11/01/91        02/01/94       01/10/00
5,375,572        08/130,244        10/01/93        12/27/94       01/12/00
5,391,721        08/013,308        02/04/93        02/21/95       01/12/00
5,453,783        07/940,261        09/02/92        09/26/95       01/10/00