Patent Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 03/26/99

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,533,986        06/547,376        10/31/83        08/06/85       03/31/99
5,060,992        07/667,485        03/11/91        10/29/91       03/30/99
5,076,429        07/681,642        04/05/91        12/31/91       03/31/99
5,148,926        07/806,698        12/12/91        09/22/92       03/31/99
5,243,333        07/921,136        07/29/92        09/07/93       03/31/99
5,265,837        07/901,157        06/19/92        11/30/93       03/31/99
5,299,711        07/970,863        11/03/92        04/05/94       03/30/99
5,307,544        07/906,335        06/30/92        05/03/94       03/31/99
5,313,989        08/021,243        02/23/93        05/24/94       03/31/99
5,322,311        07/788,474        11/06/91        06/21/94       03/31/99
5,337,295        07/886,035        05/19/92        08/09/94       03/30/99
5,342,536        07/992,513        12/17/92        08/30/94       03/30/99