Patents Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 04/14/00

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,544,204        06/440,022        11/08/82        10/01/85       04/20/00
4,591,008        06/643,220        08/22/84        05/27/86       04/19/00
4,611,207        06/547,591        10/31/83        09/09/86       04/19/00
4,622,574        06/759,728        07/29/85        11/11/86       04/14/00
4,677,067        06/623,373        06/22/84        60/30/87       04/19/00
4,683,178        06/827,023        02/07/86        07/28/87       04/14/00
4,687,538        06/841,407        03/19/86        08/18/87       04/14/00
4,717,015        06/318,395        11/05/81        01/05/88       04/18/00
4,943,903        07/322,836        03/14/89        07/24/90       04/18/00
4,995,936        07/385,686        07/27/89        02/26/91       04/19/00
5,024,418        07/404,296        09/07/89        06/18/91       04/18/00
5,078,579        07/544,245        06/26/90        01/07/92       04/19/00
5,303,479        07/877,548        05/01/92        04/19/94       04/19/00
5,305,840        07/944,430        09/14/92        04/26/94       04/17/00
5,317,677        07/869,402        04/16/92        05/31/94       04/14/00
5,322,248        07/857,876        03/26/92        06/21/94       04/18/00
5,379,938        08/073,333        08/16/93        01/10/95       04/17/00
5,422,934        08/062,577        05/17/93        06/06/95       04/14/00
5,427,650        07/904,217        06/25/92        06/27/95       04/17/00
5,443,984        08/361,763        12/22/94        08/22/95       04/18/00
5,483,193        08/409,397        03/24/95        01/09/96       04/18/00
5,498,540        08/362,236        12/22/94        03/12/96       04/18/00