Patent Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 10/15/99

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

Re. 33,939        07/655,148        02/14/91        05/26/92       10/18/99
Re. 35,814        08/631,082        04/12/96        06/02/98       10/15/99
4,607,966        06/670,031        11/09/84        08/26/86        10/19/99
4,628,901        06/832,012        02/24/86        12/16/86        10/18/99
4,677,004        06/783,324        10/02/85        06/30/87        10/19/99
4,767,509        07/062,641        06/16/87        08/30/88        10/15/99
4,786,390        07/067,452        06/12/87        11/22/88        10/15/99
4,820,961        07/188,475        04/29/88        04/11/89        10/18/99
4,994,407        07/247,053        09/20/88        02/19/91        10/15/99
5,281,143        07/880,565        05/08/92        01/25/94        10/15/99
5,309,655        07/804,390        12/10/91        05/10/94        10/15/99
5,339,497        08/030,027        03/10/93        08/23/94        10/15/99
5,360,524        08/047,265        04/13/93        11/01/94        10/20/99
5,425,388        08/194,579        02/10/94        06/20/95        10/20/99
5,430,334        07/950,315        09/24/92        07/04/95        10/15/99